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Featured4 min readNASA, IBM Research to Release New AI Model for Weather, Climatearticle3 days ago7 min readNASA Tool Gets Ready to Image Faraway Planetsarticle4 days ago4 min readNASA, Sierra Space Deliver Dream Chaser to Florida for Launch Preparationarticle5 days ago

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How Many Solar Systems Are in Our Galaxy? | NASA Space Place – NASA Science for Kids
Spotting an exoplanet around a faraway star is like spotting a firefly next to a lighthouse. The light from the lighthouse is so bright that you would have a hard time spotting the flicker of a firefly. In the same way, all stars are bigger and staggeringly bright compared to the planets orbiting them.

What is it like in other planetary systems?
So far, the planets outside our solar system have proven to be fascinating and diverse. One planet, known as HD 40307g, is a “super Earth,” with a mass about eight times that of Earth. The force of gravity there would be much stronger than here at home. You would weigh twice as much there as you do on Earth!
Another planet, called Kepler-16b, turns out to orbit two stars. A sunset there would provide a view of two setting stars! 

An illustration that shows what it might look like to stand on the surface of Kepler-16-b. Image credit: Courtesy NASA/JPL-Caltech.

In another planetary system, called TRAPPIST-1, there are not one…not two…but seven Earth-sized planets that could be covered in liquid water. The planets are relatively close together, too. If you were to stand on the surface of a TRAPPIST-1 planet, you might see six other planets on the horizon! 

This illustration shows what it might be like on the surface of TRAPPIST-1f, one of the seven planets in the TRAPPIST-1 system. Image credit: NASA/JPL-Caltech

How will astronomers keep finding distant solar systems?
NASA’s Kepler mission found more than 2,600 exoplanets during its nine year mission. It has also made a list of more than 3,000 additional potential exoplanets that astronomers need to study more carefully to be sure that they are indeed planets.
NASA's Transiting Exoplanet Survey Satellite (TESS) mission is continuing the hunt for exoplanets. While Kepler primarily searched within one particular patch of the sky, TESS is observing the entire sky to locate thousands of planets orbiting the nearest and brightest stars.
What Are Constellations? | NASA Space Place – NASA Science for Kids
What Are Constellations? | NASA Space Place – NASA Science for Kids

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What Are Constellations?

The Short Answer:

	There are a few different definitions of constellations, but many people think of constellations as a group of stars. The constellations you can see at night depend on your location on Earth and the time of year. Constellations were named after objects, animals, and people long ago. Astronomers today still use constellations to name stars and meteor showers.
	

There are a few different definitions of constellations, but many people think of constellations as a group of stars. Often, it's a group of stars that looks like a particular shape in the sky and has been given a name. These stars are far away from Earth. They are not connected to each other at all. Some stars in a constellation might be close while others are very far away. But, if you were to draw lines in the sky between the stars like a dot-to-dot puzzle – and use lots of imagination – the picture would look like an object, animal, or person.
Over time, cultures around the world have had different names and numbers of constellations depending on what people thought they saw. Today, there are 88 officially recognized constellations.

This group of stars is called the "big dipper." If you trace a line between the stars, it looks like a ladle, or dipper, that you'd use to dip soup from a pot. This photo of the big dipper was taken by an astronaut on the International Space Station, but you can often see this group of stars from the ground, too! Credit: NASA/Donald R. Pettit
What constellations can you see in the night sky?
The constellations you can see at night depend on the time of year. Earth orbits around the Sun once each year. Our view into space through the night sky changes as we orbit. So, the night sky looks slightly different each night because Earth is in a different spot in its orbit.
Feedback – Exoplanet Exploration: Planets Beyond our Solar System
Seeing, Believing: 15 Years of Exoplanet Images 

Six "sub-Neptunes" orbit their star in a kind of rhythmic dance – one easily set to music.

Discovery Alert: Watch the Synchronized Dance of a 6-Planet System

Scientists find that a glowing cloud that obscured a star was caused by a cataclysmic collision of two giant exoplanets.

Discovery Alert: Glowing Cloud Points to Cosmic Collision 

A large, gaseous planet orbits a star that should have destroyed it.

Discovery Alert: The Planet that Shouldn't Be There

With the discovery of six new exoplanets, scientists have tipped the scales and surpassed 5,500 exoplanets found (there are now 5,502 known exoplanets, to be exact).

Discovery Alert: With Six New Worlds, 5,500 Discovery Milestone Passed!

Stars farther from the center of our galaxy possess fewer of the most common types of planets, a recent study shows.

Discovery Alert: On Our Galaxy's Outskirts, a Poverty of Planets

Scientists used the Webb Telescope identified water vapor in the atmosphere of WASP-18 b, and made a temperature map of the planet as it slipped behind, and reappeared from, its star.

Discovery Alert: Webb Maps and Finds Traces of Water in an Ultra-hot Gas Giant's Atmosphere

A team of astrophysicists and citizen scientists have identified what may be some of the last planets NASA’s retired Kepler space telescope observed during its nearly decade-long mission. 

Astronomers Discover Planets in NASA Kepler's Final Days of Observations

Explore Alien Worlds

Exoplanet Travel Bureau

This set of travel posters envision a day when the creativity of scientists and engineers will allow us to do things we can only dream of now.

Strange New Worlds

Explore an interactive gallery of some of the most intriguing and exotic planets discovered so far.

Historic Timeline

A planetary tour through time. The ancients debated the existence of planets beyond our own; now we know of thousands. 

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What is the Universe? - NASA Science
&amp; Dwarf PlanetsAsteroids, Comets &amp; MeteorsThe Kuiper BeltThe Oort CloudSkywatchingEspañol CienciaAeronáuticaCiencias TerrestresSistema SolarUniversoScience All NASA ScienceEarth SciencePlanetary ScienceAstrophysics & Space ScienceThe Sun & HeliophysicsBiological & Physical SciencesLunar ScienceCitizen ScienceAstromaterialsAeronautics ResearchHuman Space Travel ResearchExploreSearchSubmitNews & EventsMultimediaNASA+…ExoplanetsWhat is the Universe?Exoplanets HomeExoplanets OverviewExoplanets FactsTypes of ExoplanetsStarsWhat is the UniverseSearch for LifeThe Big QuestionsAre We Alone?Can We Find Life?The Habitable ZoneWhy We SearchDiscoveriesDiscoveries DashboardHow We Find and CharacterizeMissionsPeopleExoplanet CatalogImmersiveThe ExoplaneteersExoplanet Travel Bureau5 Ways to Find a PlanetStrange New WorldsUniverse of MonstersGalaxy of HorrorsNewsStoriesBlogMultimediaResourcesGlossaryEyes on ExoplanetsExEPExplore This SectionExoplanets HomeExoplanets OverviewSearch for LifeDiscoveriesImmersiveNewsMultimediaResourcesExEPWhat is the Universe?ContentsHow old is Earth?How old is the universe?What is the universe made of?How has our view of the universe changed over time?The universe is everything. It includes all of space, and all the matter and energy that space contains. It even includes time itself and, of course, it includes you.Earth and the Moon are part of the universe, as are the other planets and their many dozens of moons. Along with asteroids and comets, the planets orbit the Sun. The Sun is one among hundreds of billions of stars in the Milky Way galaxy, and most of those stars have their own planets, known as exoplanets.The Milky Way is but one of billions of galaxies in the observable universe — all of them, including our own, are thought to have supermassive black holes at their centers.
Strange New Worlds - NASA Science
Since then, we've discovered thousands more. Here are a few of our favorites.Kepler-16b - 1 planet, 2 starsDiscovered 2011: Kepler-16b is a world where two suns set over the horizon instead of just one, the first Tatooine-like planet found in our galaxy.ViewKepler-22b - Possible water worldDiscovered 2011: A possible ocean world orbiting in the habitable zone—the region around a star where the temperature is right for liquid water, a requirement for life on Earth.ViewKepler-7b - First to be cloud-mappedDiscovered 2009: A massive world called a hot Jupiter, Kepler-7b was the first exoplanet to have its clouds mapped.ViewKepler-452 b - Earth's older cousinDiscovered 2015: An "Earth-cousin" that orbits a star like our sun in the habitable zone, where liquid water could exist.ViewKELT-9 b - Hotter than most starsDiscovered 2017: KELT-9b is so hot that the heat tears molecules apart on the dayside.ViewWASP-12 b - Being eaten by parent starDiscovered 2008: The doomed planet WASP-12b is a hot Jupiter that orbits so close to its parent star, it's being torn apart.
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What is the Universe? - NASA Science
In the early 21st century alone, astronomers discovered thousands of planets around other stars, detected gravitational waves for the first time and produced the first image of a black hole.Using the Event Horizon Telescope, scientists obtained an image of the black hole at the center of galaxy M87.Event Horizon Telescope collaboration et al.With ever-advancing technology and knowledge, and no shortage of imagination, humans continue to lay bare the secrets of the cosmos. New insights and inspired notions aid in this pursuit, and also spring from it. We have yet to send a space probe to even the nearest of the billions upon billions of other stars in the galaxy. Humans haven’t even explored all the worlds in our own solar system. In short, most of the universe that can be known remains unknown.The universe is nearly 14 billion years old, our solar system is 4.6 billion years old, life on Earth has existed for maybe 3.8 billion years, and humans have been around for only a few hundred thousand years. In other words, the universe has existed roughly 56,000 times longer than our species has. By that measure, almost everything that’s ever happened did so before humans existed. So of course we have loads of questions — in a cosmic sense, we just got here.Our first few decades of exploring our own solar system are merely a beginning. From here, just one human lifetime from now, our understanding of the universe and our place in it will have undoubtedly grown and evolved in ways we can today only imagine.Next: The Search for Life: Are We Alone?Return to topThe National Aeronautics and Space AdministrationNASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery.About NASA's MissionJoin UsHomeNews & EventsMultimediaNASA+MissionsHumans in SpaceEarth & ClimateThe Solar SystemThe UniverseScienceAeronauticsTechnologyLearning ResourcesAbout NASANASA en EspañolFollow NASAMore NASA Social AccountsNASA NewslettersSitemapFor MediaPrivacy PolicyFOIANo FEAR ActOffice of the IGBudget & Annual ReportsAgency Financial ReportsContact NASAAccessibilityPage Last Updated:last monthPage Editor:SMD Content EditorsResponsible NASA Official for Science:Dana Bolles
How We Find and Characterize - NASA Science
That means there are more than a trillion planets in our galaxy alone, many of them in Earth’s size range.“Right now we know, for the first time, that small planets are very common,” said Sara Seager, a professor at the Massachusetts Institute of Technology and an exoplanet research pioneer. “It’s phenomenal. We had no way to know that before Kepler. We’ll just say, colloquially: They’re everywhere.”This artist's conception shows a young, hypothetical planet around a cool star. A soupy mix of potentially life-forming chemicals can be seen pooling around the base of the jagged rocks. Observations from NASA's Spitzer Space Telescope hint that planets around cool stars – the so-called M-dwarfs and brown dwarfs that are widespread throughout our galaxy – might possess a different mix of life-forming, or prebiotic, chemicals than our young Earth.NASA/JPL-Caltech/T. PyleRadial Velocity: Reading the WobbleThe planet discovered in 1995 was a hot, star-hugging gas giant believed to be about half the size of Jupiter. It tugged so hard on its parent star as it raced around in a four-day orbit that the star’s wobbling was obvious to earthly telescopes – once astronomers knew what to look for.Artist's concept of 51 Pegasi b, also called "Dimidium," was the first exoplanet discovered orbiting a star like our Sun. This groundbreaking find in 1995 confirmed planets like Earth could exist elsewhere in the universe.NASAFinding this fast-moving gas giant, known as 51 Pegasi b, kicked off what might be called the “classical” period of planet hunting. The early technique of tracking wobbling stars revealed one planet after another, many of them large “hot Jupiters” with tight, blistering orbits.The wobble method measures changes in a star’s “radial velocity.” The wavelengths of starlight are alternately squeezed and stretched as a star moves slightly closer, then slightly farther away from us. Those gyrations are caused by gravitational tugs, this way and that, from orbiting planets.Transits: Planets Found in Dips in LightThe Kepler Space Telescope (2009-2018) ushered in what we could call the “modern” era of planet hunting.