In this photo provided by NASA, the SpaceX Falcon 9 rocket, with the Dragon spacecraft onboard, launches from pad 39A at NASA's Kennedy Space Center in Cape Canaveral, Fla, Saturday, June 3, 2017. SpaceX... (Associated Press) 
 
 CAPE CANAVERAL, Fla. (AP) — SpaceX launched its first recycled cargo ship to the International Space Station on Saturday, yet another milestone in its bid to drive down flight costs. 
 
 After a two-day delay caused by thunderstorms, the unmanned Falcon rocket blasted off carrying a Dragon capsule that made a station delivery nearly three years ago. When this refurbished Dragon reaches the orbiting lab on Monday, it will be the first returning craft since NASA's now-retired shuttles. 
 
 The first-stage booster flown Saturday afternoon was brand new, and as is now the custom, returned to Cape Canaveral following liftoff for a successful vertical touchdown. "The Falcon has landed," SpaceX Mission Control declared from company headquarters in Hawthorne, California, and a cheer went up. 
 
 The plan is to launch the booster again, instead of junking it in the ocean as so many other rocket makers do. Just two months ago, SpaceX launched its first recycled booster on a satellite mission. Another flight featuring a reused booster is coming up later this month. 
 
 This Dragon capsule, meanwhile, came back for take two following a few modifications and much testing. Shortly before liftoff, a SpaceX vice president, Hans Koenigsmann, called the Dragon reflight "a pretty big deal." 
 
 It's all part of the company's quest, he said, to lower the cost of access to space through reusability. 
 
 "Overall a great day," Koenigsmann later told reporters. 
 
 "Another wonderful launch," added NASA's Ven Feng, a station manager. 
 
 SpaceX chief Elon Musk tweeted early Sunday morning: "It's starting to feel kinda normal to reuse rockets. Good. That's how it is for cars & airplanes and how it should be for rockets." 
 
 The Dragon soaring Saturday has the same hull and most of the same parts from its 2014 flight. SpaceX installed a new heat shield and parachutes, among a few other things, for the trip back to Earth at flight's end. The Dragon is the only supply ship capable of surviving re-entry; all the others burn up in the atmosphere. NASA's other supplier, Orbital ATK, will see its cargo carrier depart the 250-mile-high complex on Sunday, six weeks after arriving. 
 
 Besides the usual supplies, SpaceX's latest 6,000-pound shipment includes mice and flies for research, a new kind of roll-up solar panel and a neutron star detector. 
 
 For now, SpaceX said savings are minimal because of all the inspections and tests performed on the already flown parts. NASA's space station program manager, Kirk Shireman, told reporters earlier in the week that SpaceX did a thorough job recertifying the Dragon and that the risk is not substantially more than if this were a capsule straight off the factory floor. He said the entire industry is interested in "this whole notion of reuse," first realized with the space shuttles. 
 
 It was the 100th launch from NASA's hallowed Launch Complex 39A at Kennedy Space Center, the departure point for the Apollo moon shots as well as dozens of shuttle missions, including the last one in 2011. SpaceX now leases the pad from NASA; the company's first launch from there was in February. 
 
 SpaceX has been hauling station supplies for NASA for five years, both up and down. This is the company's 11th mission under a NASA contract. The company's next step is to deliver astronauts using modified Dragons. That could occur as early as next year. 
 
 Until SpaceX and Boeing start transporting crews, astronauts will continue to ride Russian rockets. On Friday, a Russian and Frenchman returned from the space station in their Soyuz capsule, leaving two Americans and a Russian behind. The station was zooming over Oman in the Persian Gulf when the Falcon took flight. 
 
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 A refurbished robotic Dragon spaceship rocketed into orbit from Florida on Saturday aboard a SpaceX Falcon 9 launcher, hauling nearly 6,000 pounds of crew provisions and biological, astrophysics and space technology experiments on a two-day trip to the International Space Station. 
 
 The unpiloted capsule soared into a late afternoon sky from launch pad 39A at NASA’s Kennedy Space Center at 5:07:38 p.m. EDT (2107:38 GMT) Saturday, two days later than planned after a thunderstorm prevented liftoff Thursday. 
 
 Nine Merlin 1D engines, generating a combined 1.7 million pounds of thrust, powered the 213-foot-tall (65-meter) Falcon 9 rocket through a high-altitude cloud deck as the launcher arced to the northeast, aligning with the space station’s orbital track. 
 
 It was the 100th launch from historic pad 39A, the previous home to Saturn 5 moon rockets and space shuttles. SpaceX began launch operations there in February, and has now flown six rockets from the seaside launch complex. 
 
 The Falcon 9’s first stage engines shut down and deployed the rocket’s second stage more than 40 miles (65 kilometers) over the Atlantic Ocean, then the booster activated nitrogen cold gas thrusters to flip around and fly tail first. 
 
 While the upper stage accelerated into orbit, three of the Merlin’s first stage engines ignited to begin maneuvers to return the first stage to Landing Zone 1, and two more braking burns slowed the 156-foot-tall (47-meter) for a smooth vertical touchdown around 9 miles (14 kilometers) from where the mission started. 
 
 The landing marked the fifth time SpaceX has returned a rocket booster to Cape Canaveral — all successful. The commercial launch company has recovered 11 rockets in 16 tries overall, a figure that includes landings at sea. 
 
 SpaceX aims to reuse the first stages, an initiative the company says will slash launch costs. The rocket that launched on the space station resupply run Saturday was entirely new, but the primary structure of the gumdrop-shaped Dragon cargo capsule on top previously flew on a 34-day orbital mission in September and October 2014, another first for SpaceX. 
 
 Engineers examined and stripped the spacecraft’s structure after it splashed down in the Pacific Ocean on Oct. 25, 2014, following a visit to the space station, but the “majority” of the Dragon cargo capsule is the original article, according to Hans Koenigsmann, SpaceX’s director of flight reliability. 
 
 He said engineers compared the structural loads and shaking components inside the Dragon capsule experienced on its 2014 flight with their design limits. 
 
 “That tells us how much life the component has, and we make sure that the component has enough life for the next round,” Koenigsmann said. “There is a statistical variation, so you have to make a worst-case assumption, basically, to be on the safe side.” 
 
 SpaceX goes through a similar review of parts on Falcon 9 boosters before clearing them for a re-flight, he said. 
 
 Kirk Shireman, NASA’s program manager for the International Space Station, said before Saturday’s launch that the space agency expects to approve SpaceX plans to re-fly more Dragon capsules and Falcon 9 boosters on future cargo missions to the orbiting research outpost. 
 
 SpaceX has two multibillion-dollar contracts with NASA to ferry equipment to and from the space station. The terms of the deal call for at least 26 missions, and 10 of those are in the books, including a failed cargo launch in 2015. 
 
 NASA has also contracted with SpaceX to develop a Crew Dragon vehicle capable to ferrying astronauts to and from the space station beginning as soon as next year. 
 
 Officials said SpaceX’s next cargo mission to the station, scheduled for launch some time in August, will employ a newly-manufactured Dragon capsule. 
 
 “We share the results with NASA, and review them together, and we conclude that we can either fly a component, or in some cases, we have to make a swap with a new component,” Koenigsmann said, adding that such occurrences were “very few.” 
 
 According to Koenigsmann, SpaceX technicians replaced several items that were exposed to salt water after splashdown, such as batteries and the capsule’s heat shield. But the hull, thrusters, harnessing, propellant tanks, and some avionics boxes are original, he said. 
 
 “I can tell you the majority of this Dragon has been in space before,” Koenigsmann said. 
 
 Officials did not say if NASA was compensated for its approval of SpaceX’s plans to launch a refurbished Dragon capsule to approach the space station. 
 
 Without specifying details, Shireman said the agreement is part of a normal back-and-forth between the government and the commercial operator, in which one party barters with the other. 
 
 The Dragon spacecraft is on a two-day voyage to the space station, where it is scheduled to arrive at 10 a.m. EDT (1400 GMT) Monday, when astronauts Peggy Whitson and Jack Fischer will grapple the approaching capsule with the station’s Canadian-built robotic arm. 
 
 “The space station is in excellent shape, ready to receive Dragon,” said Ven Feng, manager of the space station transportation integration office at NASA’s Johnson Space Center in Houston. 
 
 The robot arm will move the Dragon supply ship to a berthing port on the station’s Harmony module, where it is scheduled to stay for nearly one month. 
 
 The station crew, reduced to three after the landing of a Russian cosmonaut and French astronaut Friday, will unpack 3,761 pounds (1,665 kilograms) of equipment and experiments loaded inside the Dragon capsule’s previously-flown pressurized module. 
 
 Some food and provisions for the station’s crew are strapped inside the Dragon freighter, but research investigations take up the bulk of the ship’s volume. 
 
 “Really, the utility of this SpaceX mission is science,” Feng said. “We have literally tons and tons of science going up on this mission.” 
 
 Three payloads stowed inside the Dragon’s external rear trunk will be be removed robotically. 
 
 One of the unpressurized experiments, NASA’s Neutron Star Interior Composition Explorer, will study the super-dense leftovers from violent supernova explosions. Made of 56 individual X-ray telescopes, the NICER instrument will observe neutron stars, the collapsed city-sized remnants of stars that have used up all of their nuclear fuel. 
 
 Scientists compare the density of a neutron star to cramming the mass Mount Everest into a sugar cube. One teaspoon of neutron star matter would weight a billion tons on Earth, according to NASA. 
 
 Developed by NASA’s Goddard Space Flight Center, the Massachusetts Institute of Technology and the Naval Research Laboratory, the neutron star observer will spend 18 months detecting X-ray signals coming from deep space. 
 
 “Neutron stars are fantastical stars that are extraordinary in many ways,” said Zaven Arzoumanian, NICER’s deputy principal investigator and science lead at Goddard. “They are the densest objects in the universe, they are the fastest-spinning objects known, they are the most strongly magnetic objects known.” 
 
 The NICER science team wants to know the structure and composition of neutron stars, which are so extreme that normal atoms are pulverized, freeing subatomic particles like neutrons, protons and electrons. 
 
 “As soon as you go below the surface of a neutron star, the pressures and densities rise extremely rapidly, and soon you’re in an environment that you can’t produce in any lab on Earth,” said Slavko Bogdanov, a research scientist at Columbia University who leads the NICER light curve modeling group. 
 
 Unlike black holes, which develop from explosions of stars more than 20 times the mass of the sun, neutron stars can be directly observed. 
 
 “They emit light all across the spectrum, from radio waves to visible light up to X-rays and gamma rays, primarily in narrow beams from their magnetic poles,” Arzoumanian said. “Just like the Earth, the magnetic poles on a neutron star are not necessarily aligned with the spin of the star, so you can get narrow beams that sweep as the star spins, just like a lighthouse. 
 
 “And if we happen to be in the path of the sweep we see a flash everytime one of these beams go by and the stars from a distance appear to be pulsing, so they’re called pulsars,” Arzoumanian said. 
 
 Scientists will also demonstrate the potential of using the timing of pulses from neutron stars for deep space navigation. 
 
 “We’re going to look at a subset of pulsars in the sky called millisecond pulsars,” said Keith Gendreau, NICER’s principal investigator at Goddard. “In some of these millisecond pulsars, the pulses that we see are so regular that they remind us of atomic clocks.” 
 
 Atomic clocks are the basis of the Global Positioning System satellites, according to Gendreau. 
 
 Another payload bolted inside the Dragon spacecraft’s trunk is a mounting platform for multiple Earth-imaging instruments, such as high-resolution digital cameras and hyperspectral imagers. 
 
 Developed commercially by Teledyne Brown, the MUSES device to be attached outside the space station is designed to accommodate several Earth-observing cameras by providing the individual instruments with pointing, power and data relay connections. 
 
 The third unpressurized experiment on Saturday’s launch is the Roll-Out Solar Array, or ROSA, made by Deployable Space Systems of Santa Barbara, California. 
 
 The U.S. Air Force Research Laboratory funded the solar array test flight, which is intended to test the structure’s ability to extend and retract, check its resilience to vibrations and other forces, measure its thermal gradients, and verify it can generate electricity. 
 
 The new solar array design, which unfolds like a party favor, could be used on future commercial satellites. 
 
 The array launched rolled up in a spool, but the experiment will be pulled from Dragon’s trunk around nine days after launch by the station robotic arm. While remaining in the arm’s grasp, the solar array will extend to a length of about 15 feet (5 meters) and remain unfurled for around a week. 
 
 ROSA is important to the space industry,” said Jeremy Banik, the ROSA demonstration’s principal investigator from the Air Force Research Laboratory. “All spacecraft need power, and tradiational solar panels are made with square, flat plates that accordian fold with mechanical hinges. 
 
 “The problem is, these panels tend to be heavy and bulky, and we just can’t make them any bigger than what we do today. ROSA solves this problem by shrinking mass by 20 percent and stowed volume by a factor of four over these rigid panels,” Banik said. 
 
 Once the week-long test is finished, the experiment will be returned to the Dragon’s trunk for disposal. 
 
 Live animals were also aboard Saturday’s launch, including 40 mice inside specially-designed transporters for an investigation into a treatment that could combat bone loss in astronauts on long-duration space missions and osteoporosis in patients on the ground. 
 
 Once the mice arrive at the space station, astronauts will treat the rodents with NELL-1, a therapeutic treatment designed to promote bone growth, according to Chia Soo, the chief scientist for the experiment and a professor of plastic, reconstructive and orthopaedic surgery at UCLA. 
 
 “Men and women past the age of 50, on the average, lose about a half-percent of bone mass per year,” Soo said. “But in microgravity conditions, the astronaut, on average, loses anywhere from 1 to 2 percent of bone mass per month.” 
 
 She added that bone loss in astronauts has “tremendous implications for humans with respect to long-term space travel or space habitation in microgravity because we end up progressively losing bone mass.” 
 
 Twenty of the mice will return to Earth alive with the SpaceX Dragon supply ship in early July, the first time the commercial spacecraft has landed with live animals on-board. The 20 mice that come back alive will go to UCLA’s laboratories for additional research and treatment. 
 
 The other 20 mice will remain on the space station for more observation and comparative studies with the mice on Earth. All of the animals will eventually be euthanized. 
 
 “If successful, this will have tremendous implications for patients on Earth because if you look at statistics … approximately one in every two to three females over the age of 50, or one in every four to five males over the age of 50, will have an osteoporosis-related fracture,” Soo said. 
 
 “We are hoping this study will give us some insights on how NELL-1 can work under these extreme conditions and if it can work for treating microgravity-related bone loss, which is a very accelerated, severe form of bone loss, then perhaps it can (be used) for patients one day on Earth who have bone loss due to trauma or due to aging or disease,” Soo said. 
 
 A swarm of fruit flies launched to the space station to examine how prolonged spaceflight affects their heart function. 
 
 The hearts of the insects beat at about same rate as the human heart, making it a useful analog, scientists said. 
 
 Researchers are sending between 4,000 and 6,000 fruit fly eggs to the space station, where they will hatch before coming back to Earth aboard the Dragon spacecraft. 
 
 “We would like to understand the role of microgravity on astronaut heart function in order to try to prevent long-term effects when they are in space for long periods and after they come back,” said Karen Ocorr, a co-investigator on the fruit fly experiment from the Sanford Burnham Research Institute. 
 
 “But there are real-world implications as well for people who are spending long periods of time in bedrest or immobilized,” Ocorr said. “We expect that what we find in our studies on the ISS will have implications for maintaining cardiac function in those sorts of situations.” 
 
 Saturday’s successful launch clears the way for four more SpaceX missions over the next month. 
 
 Next on the company’s jam-packed manifest is BulgariaSat 1, Bulgaria’s first communications satellite, scheduled for liftoff from the Kennedy Space Center on June 15. 
 
 BulgariaSat 1’s launch window June 15 opens at 2:10 p.m. EDT (1810 GMT) and extends two hours. 
 
 Koenigsmann told reporters he did not expect BulgariaSat 1’s mid-June launch to be delayed after the two-day slip in the cargo mission’s blastoff this weekend. BulgariaSat 1, which is already being prepared for launch in a processing facility at Cape Canaveral, will launch on a previously-flown Falcon 9 booster. 
 
 SpaceX plans its fourth launch from Vandenberg Air Force Base in California on June 25 with the second batch of 10 small new-generation satellites for Iridium’s orbiting voice and data relay network. 
 
 The Intelsat 35e high-throughput communications satellite will follow no earlier than July 1 from SpaceX’s Florida launch base. 
 
 The SpaceX launch teams have conducted three launches in the last 34 days, with three more planned in the next four weeks. 
 
 Ground crews, engineers and managers are “learning to deal with this operation better and better every time,” Koenigsmann said after Saturday’s launch. “The situation that we launch from both coasts is something that is somewhat new for us. 
 
 “We’ve had this with a little bit of separation in the past, and we’ve set up the teams to be able to cope with that, and have the ability to launch from both sites within a short period of time,” he said. 
 
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 Follow Stephen Clark on Twitter: @StephenClark1.
– SpaceX launched its first recycled cargo ship to the International Space Station on Saturday, yet another milestone in its bid to drive down space flight costs. After a two-day delay caused by thunderstorms, the unmanned Falcon rocket blasted off carrying a Dragon capsule that made a station delivery nearly three years ago, reports the AP. When this refurbished Dragon reaches the orbiting lab on Monday, it will be the first returning craft since NASA's now-retired shuttles. The first-stage booster flown Saturday afternoon was brand new, and as is now the custom, returned to Cape Canaveral following liftoff for a successful vertical touchdown. That's the fifth time SpaceX has returned a rocket booster to Cape Canaveral, notes Spaceflightnow.com. "The Falcon has landed," SpaceX Mission Control declared, and a cheer went up. The plan is to launch the booster again, instead of junking it in the ocean as so many other rocket makers do. Just two months ago, SpaceX launched its first recycled booster on a satellite mission. Another flight featuring a reused booster is due later this month. This Dragon capsule, meanwhile, came back for take two following a few modifications and much testing. Shortly before liftoff, SpaceX VP Hans Koenigsmann called the Dragon reflight "a pretty big deal." "Overall a great day," Koenigsmann later told reporters. SpaceX chief Elon Musk tweeted early Sunday: "It's starting to feel kinda normal to reuse rockets. Good. That's how it is for cars & airplanes and how it should be for rockets." For now, SpaceX says savings are minimal because of all the inspections and tests performed.