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Line Between Planets, Stars article 5 days ago](https://science.nasa.gov/missions/webb/nasas-webb-redefines-dividing-line-between-planets-stars/) ### Highlights [ 12 min read NASA Answers Your Most Pressing Artemis II Questions article 2 weeks ago](https://www.nasa.gov/missions/nasa-answers-your-most-pressing-artemis-ii-questions/) [ 1 min read Artemis II Podcast Series article 3 weeks ago](https://www.nasa.gov/artemispodcast/) [ 7 min read NASA Releases Artemis II Moon Mission Launch Countdown article 3 weeks ago](https://www.nasa.gov/general/nasa-releases-artemis-ii-moon-mission-launch-countdown/) ### Highlights [ 3 min read Spring Rains Saturate Michigan article 3 days ago](https://science.nasa.gov/earth/earth-observatory/spring-rains-saturate-michigan/) [ 3 min read Eyeing the Richat Structure article 4 days ago](https://science.nasa.gov/earth/earth-observatory/eyeing-the-richat-structure/) [ 2 min read Honoring Alex Goetz, a Landsat Legend article 4 days 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ago](https://www.nasa.gov/missions/spherex/interstellar-glaciers-nasas-spherex-maps-vast-galactic-ice-regions/) [ 5 min read NASA Finds Young Stars Dim in X-rays Surprisingly Quickly article 5 days ago](https://science.nasa.gov/missions/chandra/nasa-finds-young-stars-dim-in-x-rays-surprisingly-quickly/) [ 5 min read NASA’s Webb Redefines Dividing Line Between Planets, Stars article 5 days ago](https://science.nasa.gov/missions/webb/nasas-webb-redefines-dividing-line-between-planets-stars/) ### Highlights [ 3 min read CSDA Quality Assessment Report Evaluates Satellogic NewSat Data article 2 days ago](https://science.nasa.gov/uncategorized/csda-quality-assessment-report-evaluates-satellogic-newsat-data/) [ 1 min read Webinar 4/29: NASA CSDA Program Vendor Focus- MDA Space article 2 days ago](https://science.nasa.gov/science-research/earth-science/webinar-4-29-nasa-csda-program-vendor-focus-mda-space/) [ 3 min read Quality Assessment Report Evaluates Tomorrow.io Precipitation Radar Data 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ago](https://www.nasa.gov/es/la-nasa-anuncia-la-cobertura-de-la-mision-lunar-artemis-ii/) [ 15 min read Agenda diaria de la misión a la Luna de Artemis II de la NASA article 1 month ago](https://www.nasa.gov/es/agenda-diaria-de-la-mision-a-la-luna-de-artemis-ii-de-la-nasa/) [ 6 min read La NASA refuerza Artemis: añade una misión y perfecciona su arquitectura general article 2 months ago](https://www.nasa.gov/humans-in-space/astronauts/la-nasa-refuerza-artemis-anade-una-mision-y-perfecciona-su-arquitectura-general/) 2 min read # Do Aliens Exist? We Asked a NASA Scientist: Episode 5  Tricia Talbert Sep 10, 2021 Article Do aliens exist? Extraterrestrial life has never been discovered, but that doesn’t mean it doesn’t exist. At NASA, astrobiologists like Lindsay Hays are trying to answer one of the most profound questions ever: Is there life beyond Earth? Do aliens exist? This is a really interesting question and one that NASA has been trying to understand, explore, and figure out for a long time. We have not yet discovered life on any other planet, and we have not seen any scientifically supported evidence for extraterrestrial life. But if we think about life on this planet, beyond the big things — the elephants, the whales, redwoods trees –– and focus on the tiny things, nearly everywhere on Earth that we’ve looked, we’ve found microbial life. Our definition of habitable environments continues to expand. Off the Earth we’ve only begun to look. NASA has sent five rovers and four landers to the surface of Mars. Additionally, orbiters have been outfitted with some amazing cameras to take pictures of the whole surface of the Red Planet. But we’ve only explored a tiny fraction of Mars. And that’s only one of the promising bodies to look for life in our solar system. There are icy moons in the outer solar system like Saturn’s moon Enceladus and Jupiter’s moon Europa that look like they may have subsurface oceans that could be habitable. And that’s just what’s in our solar system. The more exoplanets we find around other stars, the more we learn about how many different environments could exist for life. We can’t yet say for sure whether or not aliens exist. To quote Carl Sagan: “The universe is a pretty big place. If it’s just us, it seems like an awful waste of space.” So, NASA will keep looking. Learn more about the NASA Astrobiology Program: <https://astrobiology.nasa.gov/> \[END VIDEO TRANSCRIPT\] **[Full Episode List](https://www.nasa.gov/we-asked-a-nasa-expert)** [**Full YouTube Playlist**](https://www.youtube.com/playlist?list=PL2aBZuCeDwlQiDSAaW1y0mOU8FC2f8v3g) ## Explore More [ 2 min read Volunteers Discover Rare Space Weather Events Using Their Ears Scientists are working to understand exactly how these waves behave, and the team behind NASA’s… Article 2 days ago](https://science.nasa.gov/get-involved/citizen-science/volunteers-discover-rare-space-weather-events-using-their-ears/) [ 3 min read Hubble Spies an Active Spiral A luminous swirl set against the deep black of space, the barred spiral galaxy IC… Article 6 days ago](https://science.nasa.gov/missions/hubble/hubble-spies-an-active-spiral/) [ 5 min read Meet NASA’s New Artemis II Science Officers NASA’s first Artemis II science officers—Kelsey Young, Trevor Graff, and Angela Garcia—are pioneering a new… Article 2 weeks ago](https://science.nasa.gov/missions/artemis/meet-nasas-new-artemis-ii-science-officers/) Keep Exploring ## Discover More Topics From NASA [Our Solar System Overview Our planetary system is located in an outer spiral arm of the Milky Way galaxy. We call it the… ](https://science.nasa.gov/solar-system/overview/) [Astrobiology ](https://science.nasa.gov/astrobiology/) [Mars Exploration Mars is the only planet we know of inhabited entirely by robots. Learn more about the Mars Missions. ](https://science.nasa.gov/planetary-science/programs/mars-exploration/) [Asteroids, Comets & Meteors Overview Asteroids, comets, and meteoroids are chunks of rock, ice, and metal left over from the formation of our solar… ](https://science.nasa.gov/asteroids-comets-meteors/) ## Share ## Details Last Updated Mar 07, 2024 Editor Tricia Talbert ## Related Terms - [Mars](https://science.nasa.gov/mars/) - [Astrobiology](https://www.nasa.gov/science-research/planetary-science/astrobiology/) - [Planetary Science](https://science.nasa.gov/planetary-science/) - [Planetary Science Division](https://science.nasa.gov/planetary-science/) - [Science Mission Directorate](https://science.nasa.gov/about-us/)  ### National Aeronautics and Space Administration NASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery. - [About NASA's Mission](https://www.nasa.gov/about/) [Join Us](https://www.nasa.gov/get-involved/) - [Home](https://www.nasa.gov/) - [News & Events](https://www.nasa.gov/news/) - [Multimedia](https://www.nasa.gov/multimedia/) - [NASA+](https://plus.nasa.gov/) - [Missions](https://www.nasa.gov/nasa-missions/) - [Humans in Space](https://www.nasa.gov/humans-in-space/) - [Earth](https://science.nasa.gov/earth/) - [The Solar System](https://science.nasa.gov/solar-system/) - [The Universe](https://science.nasa.gov/universe/) - [Science](https://science.nasa.gov/) - [Aeronautics](https://www.nasa.gov/aeronautics/) - [Technology](https://www.nasa.gov/technology/) - [Learning Resources](https://www.nasa.gov/learning-resources/) - [About NASA](https://www.nasa.gov/about/) - [NASA en Español (opens in new tab)](https://www.nasa.gov/es/) ### Follow NASA - [More NASA Social Accounts](https://www.nasa.gov/social-media/) - [NASA Newsletters](https://www.nasa.gov/nasa-newsletters/) - [Sitemap](https://www.nasa.gov/sitemap/) - [For Media](https://www.nasa.gov/news/nasa-media-contacts/) - [Privacy Policy](https://www.nasa.gov/nasa-web-privacy-policy-and-important-notices/) - [FOIA](https://www.nasa.gov/foia/) - [No FEAR Act](https://www.nasa.gov/no-fear-act/) - [Office of the IG (opens in new tab)](http://oig.nasa.gov/) - [Budget & Annual Reports](https://www.nasa.gov/budgets-plans-and-reports/) - [Agency Financial Reports](https://www.nasa.gov/organizations/budget-annual-reports/agency-financial-reports/) - [Contact NASA](https://www.nasa.gov/contact-nasa/) - [Accessibility](https://www.nasa.gov/accessibility/) - Page Last Updated: Mar 07, 2024 - Responsible NASA Official: Abigail Bowman ## Was this page helpful? × Notifications

Do aliens exist? Extraterrestrial life has never been discovered, but that doesn’t mean it doesn’t exist. At NASA, astrobiologists like Lindsay Hays are trying to answer one of the most profound questions ever: Is there life beyond Earth? Do aliens exist? This is a really interesting question and one that NASA has been trying to understand, explore, and figure out for a long time. We have not yet discovered life on any other planet, and we have not seen any scientifically supported evidence for extraterrestrial life. But if we think about life on this planet, beyond the big things — the elephants, the whales, redwoods trees –– and focus on the tiny things, nearly everywhere on Earth that we’ve looked, we’ve found microbial life. Our definition of habitable environments continues to expand. Off the Earth we’ve only begun to look. NASA has sent five rovers and four landers to the surface of Mars. Additionally, orbiters have been outfitted with some amazing cameras to take pictures of the whole surface of the Red Planet. But we’ve only explored a tiny fraction of Mars. And that’s only one of the promising bodies to look for life in our solar system. There are icy moons in the outer solar system like Saturn’s moon Enceladus and Jupiter’s moon Europa that look like they may have subsurface oceans that could be habitable. And that’s just what’s in our solar system. The more exoplanets we find around other stars, the more we learn about how many different environments could exist for life. We can’t yet say for sure whether or not aliens exist. To quote Carl Sagan: “The universe is a pretty big place. If it’s just us, it seems like an awful waste of space.” So, NASA will keep looking. Learn more about the NASA Astrobiology Program: <https://astrobiology.nasa.gov/> \[END VIDEO TRANSCRIPT\] **[Full Episode List](https://www.nasa.gov/we-asked-a-nasa-expert)** [**Full YouTube Playlist**](https://www.youtube.com/playlist?list=PL2aBZuCeDwlQiDSAaW1y0mOU8FC2f8v3g)