Astronomy and Cosmology

3708 topics in this forum

1. Why don't you see stars in NASA space pics. of Earth?

   By ulrichburke, September 29, 2016
   • 6 replies
   • 1.2k views
   • 
   • StringJunky
   • October 2, 2016

2. Arguable definition for the beginning of the universe?

   By Genecks, September 28, 2016
   • 2 replies
   • 1.1k views
   • 
   • ajb
   • September 29, 2016

3. Nature of a straight line in curved space

   By Atom Man, September 24, 2016
   • 2 replies
   • 980 views
   • 
   • pavelcherepan
   • September 29, 2016

4. Defence against solar flares.

   By LJWJ, September 21, 2016
   • 9 replies
   • 1.3k views
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   • LJWJ
   • September 26, 2016

5. How the Universe Works: Non-Dual Monistic Idealism

   By SamS, September 25, 2016
   • 0 replies
   • 855 views
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   • SamS
   • September 25, 2016

6. galaxy rotation question

   By hoola, September 10, 2016
   • 6 replies
   • 1.3k views
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   • Airbrush
   • September 10, 2016

7. Tidal Lock

   By Moontanman, September 9, 2016
   • 4 replies
   • 1.2k views
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   • Janus
   • September 10, 2016

8. Age of universe conondrum

   By Dimitri, September 8, 2016
   • 4 replies
   • 1.2k views
   • 
   • MigL
   • September 9, 2016

9. Gravity waves and the aether 1 2 3 4 32

   By Moontanman, June 16, 2016
   • 779 replies
   • 64k views
   • 
   • imatfaal
   • September 6, 2016

10. Artificial Gravity and Spacetravel

    By Airbrush, August 16, 2016
    • 15 replies
    • 1.8k views
    • 
    • Airbrush
    • September 3, 2016

11. Why physics is not universal.

    By Ihcisphysicist, August 20, 2016
    • 6 replies
    • 1.4k views
    • 
    • Klaynos
    • August 20, 2016

12. Gravity and space travel

    By noxid, August 9, 2016
    • 12 replies
    • 1.9k views
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    • Janus
    • August 14, 2016

13. Black Hole Explanation for Dark Matter

    By noxid, August 8, 2016
    • 4 replies
    • 1.2k views
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    • Mordred
    • August 8, 2016

14. Dark Worlds

    By noxid, August 2, 2016
    • 3 replies
    • 1.1k views
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    • Strange
    • August 2, 2016

15. The Earth behind the Moon

    By michel123456, July 28, 2016
    • 14 replies
    • 1.8k views
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    • Janus
    • July 31, 2016

16. Actual vs apparent universal expansion rate 1 2 3

    By StringJunky, July 25, 2016
    • 54 replies
    • 5.5k views
    • 
    • Strange
    • July 29, 2016

17. The Ratio of a Radius?

    By GeeKay, July 22, 2016
    • 3 replies
    • 1.3k views
    • 
    • GeeKay
    • July 23, 2016

18. Use of time dilation by advanced alien civilization

    By Nerexis, July 20, 2016
    • 3 replies
    • 1.4k views
    • 
    • swansont
    • July 21, 2016

19. Gravity

    By isaacknewtonnes, June 1, 2016
    • 16 replies
    • 2.9k views
    • 
    • swansont
    • July 12, 2016

20. Conclusion....below topic

    By Ihcisphysicist, July 10, 2016
    • 1 reply
    • 1k views
    • 
    • Klaynos
    • July 10, 2016

21. Beyond spacetime 1 2

    By Ultimate Infinity, July 2, 2016
    • 25 replies
    • 3.8k views
    • 
    • ajb
    • July 4, 2016

22. Environment around a star becoming a red giant

    By SPBS, June 20, 2016
    • 2 replies
    • 1k views
    • 
    • SPBS
    • June 27, 2016

23. Need help understanding the illusion of the early universe that surrounds us?

    By TakenItSeriously, June 25, 2016
    • 8 replies
    • 1.2k views
    • 
    • Mordred
    • June 26, 2016

24. Are EM forces responsible for galactic structures?

    By TakenItSeriously, June 26, 2016
    • 3 replies
    • 1.7k views
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    • swansont
    • June 26, 2016

25. Could asteroid 2016 HO3 be a Saturn V S-IVB third stage like J002E3?

    By LaurieAG, June 24, 2016
    • 1 reply
    • 1.2k views
    • 
    • Raider5678
    • June 24, 2016