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Astronomy

Planets, stars, galaxies and space exploration, with online planetariums and data from space agencies.

28 free sites · 20 in English.

1. NASA Science English science.nasa.gov

   News and explainers from NASA.

   For: General public

2. NASA Space Place English spaceplace.nasa.gov

   Space science for kids and teens.

   For: Elementary schoolMiddle & high school

3. OpenStax – Astronomy 2e English openstax.org

   Free college textbook.

   For: College

4. Khan Academy – Cosmology and astronomy English khanacademy.org

   Videos about the universe.

   For: Middle & high schoolCollege

5. European Space Agency English esa.int

   Missions, images and education.

   For: General public

6. ESO – European Southern Observatory English eso.org

   Images and news from ESO’s telescopes.

   For: General public

7. ESA/Webb English esawebb.org

   Images from the James Webb Space Telescope.

   For: General public

8. Astronomy Picture of the Day English apod.nasa.gov

   A new astronomy image explained every day.

   For: General public

9. NASA Eyes English eyes.nasa.gov

   3D visualizations of space missions.

   For: General public

10. Las Cumbres Observatory – Education English lco.global

    Activities and real telescope projects.

    For: General public

11. Sky & Telescope – Observing English skyandtelescope.org

    What to see in the night sky this week.

    For: General public

12. Astronomy Cast English astronomycast.com

    A weekly podcast through the cosmos.

    For: General public

13. Crash Course Astronomy (YouTube) English youtube.com

    Astronomy series with Phil Plait.

    For: Middle & high schoolGeneral public

14. Stellarium Web Multilingual stellarium-web.org

    A planetarium in your browser.

    For: General public

15. Stellarium (desktop) Multilingual stellarium.org

    Free planetarium for your computer.

    For: General public

16. Solar System Scope Multilingual solarsystemscope.com

    3D model of the solar system.

    For: General public

17. Celestia Multilingual celestiaproject.space

    Travel through the universe in 3D.

    For: General public

18. Heavens-Above Multilingual heavens-above.com

    When to see the Space Station from your city.

    For: General public

19. Light Pollution Map Multilingual lightpollutionmap.info

    Find dark skies for observing.

    For: General public

20. Zooniverse Multilingual zooniverse.org

    Real citizen science projects.

    For: General public

21. HubbleSite English hubblesite.org

    Images and science from the Hubble telescope.

    For: General public

22. NASA JPL – Education English jpl.nasa.gov

    Lessons and activities from JPL.

    For: General public

23. Open Yale – Frontiers in Astrophysics English oyc.yale.edu

    Yale video course.

    For: CollegeGeneral public

24. COSMOS – Astronomy Encyclopedia (Swinburne) English astronomy.swin.edu.au

    Free astronomy encyclopedia.

    For: General public

25. In-The-Sky.org English in-the-sky.org

    Night-sky guides and events.

    For: General public

26. Time and Date – Night sky English timeanddate.com

    What’s visible tonight where you live.

    For: General public

27. The Planetary Society English planetary.org

    Space science news and explainers.

    For: General public

28. KStars Multilingual kstars.kde.org

    Free, open-source planetarium.

    For: General public