{"id":96318,"date":"2009-07-08T19:26:00","date_gmt":"2009-07-08T23:26:00","guid":{"rendered":"https:\/\/www.nasa.gov\/?migration=converted-node-399061"},"modified":"2023-07-26T14:53:52","modified_gmt":"2023-07-26T18:53:52","slug":"apollo-13-mission-details","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/missions\/apollo\/apollo-13-mission-details\/","title":{"rendered":"Apollo 13: Mission Details"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><b>Mission Objective<\/b><\/h2>\n\n\n\n<p>Apollo 13 was supposed to land in the Fra Mauro area. An explosion on board forced Apollo 13 to circle the moon without landing. The Fra Mauro site was reassigned to Apollo 14. \u00a0<\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-none \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"2048\" height=\"2048\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?w=2048\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Apollo 13 insignia\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg 3969w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=150,150 150w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=300,300 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=768,768 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=1024,1024 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=1536,1536 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=2048,2048 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=50,50 50w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=100,100 100w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=200,200 200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=400,400 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=600,600 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=900,900 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=1200,1200 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2017\/03\/15012354977_8fa070721a_o.jpg?resize=2000,2000 2000w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" loading=\"eager\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">The Apollo 13 mission insignia<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\"><b>Mission Highlights<\/b><\/h2>\n\n\n\n<p>At 5 1\/2 minutes after liftoff, John \u201cJack\u201d Swigert, Fred Haise and James Lovell felt a little vibration. Then the center engine of the S-II stage shut down two minutes early. This caused the remaining four engines to burn 34 seconds longer than planned, and the S-IVB third stage had to burn nine seconds longer to put Apollo 13 in orbit.<\/p>\n\n\n\n<p>Days before the mission, backup lunar module pilot, Charles Duke, inadvertently exposed the crew to German measles. Command Module Pilot Ken Mattingly had no immunity to measles and was replaced by backup command module pilot, John\u00a0\u201cJack\u201d Swigert.<\/p>\n\n\n\n<p>Ground tests before launch indicated the possibility of a poorly insulated supercritical helium tank in the lunar module, or LM, descent stage, so the flight plan was modified to enter the LM three hours early in order to obtain an onboard readout of helium tank pressure.<\/p>\n\n\n\n<p>The No. 2 oxygen tank, serial number 10024X-TA0009, had been previously installed in the service module of Apollo 10, but was removed for modification and damaged in the process. The tank was fixed, tested at the factory, installed in the Apollo 13 service module and tested again during the Countdown Demonstration Test at NASA\u2019s Kennedy Space Center beginning March 16, 1970. The tanks normally are emptied to about half full. No. 1 behaved all right, but No. 2 dropped to only 92 percent of capacity. Gaseous oxygen at 80 pounds per square inch was applied through the vent line to expel the liquid oxygen, but to no avail. An interim discrepancy report was written, and on March 27, two weeks before launch, detanking operations resumed. No. 1 again emptied normally, but No. 2 did not. After a conference with contractor and NASA personnel, the test director decided to \u201cboil off\u201d the remaining oxygen in No. 2 by using the electrical heater within the tank. The technique worked, but it took eight hours of 65-volt DC power from the ground support equipment to dissipate the oxygen. Due to an oversight in replacing an underrated component during a design modification, this turned out to severely damage the internal heating elements of the tank.<\/p>\n\n\n\n<p>Apollo 13 was to be the third lunar landing attempt, but the mission was aborted after rupture of service module oxygen tank. Still, it was classified as a \u201csuccessful failure\u201d because of the experience gained in rescuing the crew. The mission\u2019s spent upper stage successfully impacted the moon.<\/p>\n\n\n\n<p>During the first two days, the crew ran into a couple of minor surprises, but generally Apollo 13 was looking like the smoothest flight of the program. At 46 hours, 43 minutes Joe Kerwin, the capsule communicator, or Capcom, on duty, said, \u201cThe spacecraft is in real good shape as far as we are concerned. We\u2019re bored to tears down here.\u201d It was the last time anyone would mention boredom for a long time.<\/p>\n\n\n\n<p>At 55 hours, 46 minutes, as the crew finished a 49-minute TV broadcast showing how comfortably they lived and worked in weightlessness, Lovell said, \u201cThis is the crew of Apollo 13 wishing everybody there a nice evening, and we\u2019re just about ready to close out our inspection of Aquarius and get back for a pleasant evening in Odyssey. Good night.\u201d<\/p>\n\n\n\n<p>Nine minutes later, oxygen tank No. 2 blew up, causing the No. 1 tank to also fail. The command module\u2019s normal supply of electricity, light and water was lost, and they were about 200,000 miles from Earth.<\/p>\n\n\n\n<p>The message came in the form of a sharp bang and vibration at 9:08 p.m. April 13. Swigert saw a warning light that accompanied the bang and said, \u201cHouston, we\u2019ve had a problem here.\u201d Lovell came on and told the ground that it was a main B bus undervolt.<\/p>\n\n\n\n<p>Next, the warning lights indicated the loss of two of three fuel cells, which were the spacecraft\u2019s prime source of electricity. With warning lights blinking, one oxygen tank appeared to be completely empty and there were indications that the oxygen in the second tank was rapidly depleting.<\/p>\n\n\n\n<p>Thirteen minutes after the explosion, Lovell happened to look out of the left-hand window and saw the final evidence pointing toward potential catastrophe. \u201cWe are venting something out into the\u2026 into space,\u201d he reported to Houston. Capcom Jack Lousma replied, \u201cRoger, we copy you venting.\u201d Lovell said, \u201cIt\u2019s a gas of some sort.\u201d It was oxygen gas escaping at a high rate from the second, and last, oxygen tank.<\/p>\n\n\n\n<p>The first thing the crew did, even before discovering the oxygen leak, was try to close the hatch between the CM and the LM. They reacted spontaneously, similar to a submarine crew, closing the hatches to limit the amount of flooding. First Swigert, and then Lovell, tried to lock the reluctant hatch, but the stubborn lid wouldn\u2019t stay shut. Exasperated and realizing that there wasn\u2019t a cabin leak, they strapped the hatch to the CM couch.<\/p>\n\n\n\n<p>The pressure in the No. 1 oxygen tank continued to drift downward; passing 300 pounds per square inch, then headed toward 200 pounds per square inch. Months later, after the accident investigation was complete, it was determined that when the No. 2 tank blew up, it either ruptured a line on the No. 1 tank or caused one of the valves to leak. When the pressure reached 200 pounds per square inch, the crew and ground controllers knew they would lose all oxygen, which meant that the last fuel cell also would die.<\/p>\n\n\n\n<p>At one hour, 29 seconds after the bang, Lousma said after instructions from Flight Director Glynn Lunney, \u201cIt is slowly going to zero, and we are starting to think about the LM lifeboat.\u201d Swigert replied, \u201cThat\u2019s what we have been thinking about too.\u201d<\/p>\n\n\n\n<p>Ground controllers in Houston faced a formidable task. Completely new procedures had to be written and tested in the simulator before being passed up to the crew. The navigation problem had to be solved; essentially how, when and in what attitude to burn the LM descent engine to provide a quick return home.<\/p>\n\n\n\n<p>With only 15 minutes of power left in the CM, Lousma told the crew to make their way into the LM. Haise and Lovell quickly floated through the tunnel, leaving Swigert to perform the last chores in the command module. The first concern was to determine if there were enough consumables to get home. The LM was built for only a 45-hour lifetime and it needed to be stretch to 90. Oxygen wasn\u2019t a problem. The full LM descent tank alone would suffice. In addition, there were two ascent-engine oxygen tanks and two backpacks full of oxygen that would never be used on the lunar surface. Two emergency bottles on top of those packs each had six or seven pounds in them. At LM jettison just before re-entry 28.5 pounds of oxygen remained, more than half of what was available after the explosion.<\/p>\n\n\n\n<p>Power also was a concern. There were 2,181 ampere hours in the LM batteries. Ground controllers carefully worked out a procedure where the CM batteries were charged with LM power. All noncritical systems were turned off and energy consumption was reduced to 1\/5, which resulted in having 20 percent of LM electrical power left when Aquarius was jettisoned. There was one electrical close call during the mission. One of the CM batteries vented with such force that it momentarily dropped off the line. Had the battery failed, there would have been insufficient power to return the ship to Earth.<\/p>\n\n\n\n<p>Water was the main consumable concern. It was estimated that the crew would run out of water about five hours before Earth re-entry, which was calculated at around 151 hours. However, data from Apollo 11, which had not sent its LM ascent stage crashing into the moon as in subsequent missions, showed that its mechanisms could survive seven or eight hours in space without water cooling. The crew conserved water. They cut down to six ounces each per day, 1\/5 of normal intake, and used fruit juices; they ate hot dogs and other wet-pack foods when they ate at all. The crew became dehydrated throughout the flight and set a record that stood up throughout Apollo: Lovell lost 14 pounds and the crew lost a total of 31.5 pounds, nearly 50 percent more than any other crew. Those stringent measures resulted in the crew finishing with 28.2 pounds of water, about 9 percent of the total.<\/p>\n\n\n\n<p>Removal of carbon dioxide also was a concern. There were enough lithium hydroxide canisters, which remove carbon dioxide from the spacecraft, but the square canisters from the command module were not compatible with the round openings in the lunar module environmental system. There were four cartridges from the LM and four from the backpacks, counting backups. However, the LM was designed to support two men for two days and was being asked to care for three men for about four days. After a day and a half in the LM, a warning light showed that the carbon dioxide had built up to a dangerous level. Mission control devised a way to attach the CM canisters to the LM system by using plastic bags, cardboard and to tape all materials carried on board.<\/p>\n\n\n\n<p>One of the big questions was, \u201cHow to get back safely to Earth?\u201d The LM navigation system wasn\u2019t designed to help in this situation. Before the explosion at 30 hours, 40 minutes, Apollo 13 had made the normal midcourse correction, which would take it out of a free-return-to-Earth trajectory and put it on a lunar landing course. Now the task was to get back on a free-return course. The ground computed a 35-second burn and fired it five hours after the explosion. As they approached the moon, another burn was computed; this time a long five-minute burn to speed up the return home. It took place two hours after rounding the far side of the moon.<\/p>\n\n\n\n<p>The command module navigational platform alignment was transferred to the LM, but verifying alignment was difficult. Ordinarily the alignment procedure uses an onboard sextant device, called the Alignment Optical Telescope, or AOT, to find a suitable navigation star. Then with the help of an onboard computer, it verifies the guidance platform\u2019s alignment. However, due to the explosion, a swarm of debris from the ruptured service module made it impossible to sight real stars. An alternate procedure was developed to use the sun as an alignment star. Lovell rotated the spacecraft to the attitude Houston had requested and when he looked through the AOT, the sun was just where it was expected. The alignment with the sun proved to be less than 1\/2 a degree off. The ground and crew then knew they could do the five-minute P.C. + 2 burn with assurance, cutting the total time of their voyage to about 142 hours. At 73 hours, 46 minutes into the mission, the air-to-ground transcript describes the event:<\/p>\n\n\n\n<p> <em>Lovell:<\/em> OK. We got it. I think we got it. What diameter was it?<br> <em>Haise:<\/em> Yes. It\u2019s coming back in. Just a second.<br> <em>Lovell:<\/em> Yes, yaw\u2019s coming back in. Just about it.<br> <em>Haise:<\/em> Yaw is in\u2026.<br> <em>Lovell<\/em>: What have you got?<br> <em>Haise:<\/em> Upper-right corner of the sun\u2026.<br> <em>Lovell:<\/em> We\u2019ve got it! If we raised our voices, I submit it was justified.<\/p>\n\n\n\n<p>Flight Director Gerald Griffin, a man not easily shaken, recalled: \u201cSome years later I went back to the log and looked up that mission. My writing was almost illegible, I was so damned nervous. And I remember the exhilaration running through me: My God, that\u2019s the last hurdle \u2013 if we can do that, I know we can make it. It was funny because only the people involved knew how important it was to have that platform properly aligned.\u201d Yet Griffin barely mentioned the alignment in his change-of-shift briefing \u2013 \u201cThat check turned out real well\u201d is all he said an hour after his penmanship failed him.<\/p>\n\n\n\n<p>The trip was marked by discomfort beyond the lack of food and water. Sleep was almost impossible because of the cold. When the electrical systems were turned off, the spacecraft lost an important source of heat. The temperature dropped to 38 degrees Fahrenheit and condensation formed on all the walls.<\/p>\n\n\n\n<p>The most remarkable achievement of mission control was quickly developing procedures for powering up the CM after its long, cold sleep. Flight controllers wrote the documents for this innovation in three days, instead of the usual three months. The command module was cold and clammy at the start of power-up. The walls, ceiling, floor, wire harnesses and panels were all covered with droplets of water. It was suspected conditions were the same behind the panels. The chances of short circuits caused apprehension, but thanks to the safeguards built into the command module after the disastrous Apollo 1 fire in January 1967, no arcing took place. Lovell recalled the descent to Earth, \u201cThe droplets furnished one sensation as we decelerated in the atmosphere: it rained inside the CM.\u201d<\/p>\n\n\n\n<p>Four hours before landing, the crew shed the service module; mission control had insisted on retaining it until then because everyone feared what the cold of space might do to the un-sheltered CM heat shield. Photos of the service module showed one whole panel missing and wreckage hanging out, it was a mess as it drifted away. Three hours later, the crew left the lunar module Aquarius and then splashed down gently in the Pacific Ocean near Samoa.<\/p>\n\n\n\n<p>After an intensive investigation, the Apollo 13 Accident Review Board identified the cause of the explosion. In 1965, the CM had undergone many improvements that included raising the permissible voltage to the heaters in the oxygen tanks from 28 to 65 volts DC. Unfortunately, the thermostatic switches on these heaters weren\u2019t modified to suit the change. During one final test on the launch pad, the heaters were on for a long period of time. This subjected the wiring in the vicinity of the heaters to very high temperatures (1000\u00b0F), which have been subsequently shown to severely degrade teflon insulation. The thermostatic switches started to open while powered by 65 volts DC and were probably welded shut. Furthermore, other warning signs during testing went unheeded and the tank, damaged from eight hours of overheating, was a potential bomb the next time it was filled with oxygen. That bomb exploded on April 13, 1970 \u2013 200,000 miles from Earth.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Crew<\/strong><\/h2>\n\n\n\n<p>James A. Lovell Jr., Commander<br>Fred W. Haise Jr., Lunar Module Pilot<br>John L. \u201cJack\u201d\u00a0Swigert Jr., Command Module Pilot<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Backup Crew<\/strong><\/h2>\n\n\n\n<p>John W. Young, Commander<br>Charles M. Duke Jr., Lunar Module Pilot<br>John L. \u201cJack\u201d\u00a0Swigert Jr., Command Module Pilot<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Payload<\/strong><\/h2>\n\n\n\n<p>Odyssey (CM-109)<br>Aquarius (LM-7)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Prelaunch Milestones<\/strong><\/h2>\n\n\n\n<p>6\/13\/69 \u2013 S-IVB ondock at Kennedy<br>6\/29\/69 \u2013 S-II ondock at Kennedy<br>6\/16\/69 \u2013 S-IC ondock at Kennedy<br>7\/7\/69 \u2013 S-IU ondock at Kennedy<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Launch<\/strong><\/h2>\n\n\n\n<p>April 11, 1970; 1:13 p.m. CST<br>Launch Pad 39A<br>Saturn-V AS-508<br>High Bay 1<br>Mobile Launcher Platform-3<br>Firing Room 1<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Orbit<\/strong><\/h2>\n\n\n\n<p>Altitude: 118.99 miles<br>Inclination: 32.547 degrees<br>Earth Orbits: 1.5<br>Duration: five days, 22 hours, 54 minutes, 41 seconds<br>Distance: 622,268 miles<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Landing<\/strong><\/h2>\n\n\n\n<p>April 17, 1970<br>Pacific Ocean<br>Recovery Ship: USS Iwo Jima<\/p>\n\n\n<div id=\"\" class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 article_a hds-module hds-module-full wp-block-nasa-blocks-credits-and-details\">\n<section class=\"padding-x-0 padding-top-5 padding-bottom-2 desktop:padding-top-7 desktop:padding-bottom-9\">\n\t<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n\t\t<div class=\"grid-col-12 desktop:grid-col-2 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n\t\t\t<div class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t<h2 class=\"heading-14\">Share<\/h2>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"padding-bottom-2\">\n\t\t\t\t\t<ul class=\"social-icons social-icons-round\">\n\t\t\t\t\t\t<li class=\"social-icon social-icon-x\">\n\t\t\t\t\t\t\t<a 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social-icon-rss\">\n\t\t\t\t\t\t\t<a href=\"\/feed\/\" aria-label=\"Subscribe to RSS feed.\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 800 800\" aria-hidden=\"true\"><path d=\"M493 652H392c0-134-111-244-244-244V307c189 0 345 156 345 345zm71 0c0-228-188-416-416-416V132c285 0 520 235 520 520z\"\/><circle cx=\"219\" cy=\"581\" r=\"71\"\/><\/svg>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t<\/ul>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n\t\t\t<div class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t<h2 class=\"heading-14\">Details<\/h2>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"grid-row margin-bottom-3\">\n\t\t\t\t\t<div class=\"grid-col-4\">\n\t\t\t\t\t\t<div class=\"subheading\">Last Updated<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"grid-col-8\">Jul 26, 2023<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\"><div class=\"padding-top-3 border-top-1px border-color-carbon-black \"><div class=\"margin-bottom-2\"><h2 class=\"heading-14\">Related Terms<\/h2><\/div><ul class=\"article-tags\"><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/the-apollo-program\/\">Apollo<\/a><\/li><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/mission\/apollo-13\/\">Apollo 13<\/a><\/li><\/ul><\/div><\/div>\n\t<\/div>\n<\/section>\n\t<\/div>\n\n<div id=\"\" class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 hds-module hds-module-full wp-block-nasa-blocks-related-articles\">\t\t<section class=\"hds-related-articles padding-x-0 padding-y-3 desktop:padding-top-7 desktop:padding-bottom-9\">\n\t\t\t<div class=\"w-100 grid-row grid-container maxw-widescreen padding-0 text-align-left\">\n\t\t\t\t<div class=\"margin-bottom-4\"><h2 style=\"max-width: 100%;\" class=\"width-full w-full maxw-full\">Explore More<\/h2><\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/55-years-ago-two-months-until-the-moon-landing\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"204\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg 4104w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=300,204 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=768,521 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=1024,695 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=1536,1042 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=2048,1390 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=400,271 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=600,407 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=900,611 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=1200,814 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/moon-landing-l-2-months-7-apollo-10-crew-walkout-for-launch-may-18-1969-s69-35315.jpg?resize=2000,1357 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">21 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">55 Years Ago: Two Months Until the Moon Landing<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t4 weeks ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/55-years-ago-four-months-until-the-moon-landing\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"247\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/moon-landing-l-4-months-26-apollo-9-astronauts-w-shatalov-yeliseyev-paris-air-show-1969.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/moon-landing-l-4-months-26-apollo-9-astronauts-w-shatalov-yeliseyev-paris-air-show-1969.jpg 510w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/moon-landing-l-4-months-26-apollo-9-astronauts-w-shatalov-yeliseyev-paris-air-show-1969.jpg?resize=300,247 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/moon-landing-l-4-months-26-apollo-9-astronauts-w-shatalov-yeliseyev-paris-air-show-1969.jpg?resize=400,329 400w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">21 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">55 Years Ago: Four Months Until the Moon Landing<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t3 months ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/55-years-ago-five-months-until-the-moon-landing\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"239\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg 1891w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=300,239 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=768,612 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=1024,817 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=1536,1225 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=400,319 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=600,478 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=900,718 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/02\/moon-landing-l-5-months-8-apollo-9-mcdivitt-schweickart-in-lm-sim-fisheye-feb-23-1969-ap9-ksc-69pc-15hr.jpg?resize=1200,957 1200w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">11 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">55 Years Ago: Five Months Until the Moon Landing<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t4 months ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>\u201cHouston, we\u2019ve had a problem\u2026\u201d<\/p>\n","protected":false},"author":9,"featured_media":112844,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[2713,2929],"news-tags":[],"internal-terms":[],"coauthors":[],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"Apollo 13: Mission 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