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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3693 topics in this forum

  1. Can Sirius go supernova?

    By Kevin_Hall,
    • 3 replies
    • 2.3k views

  2. Mars gravity issue

    By Kevin_Hall,
    • 15 replies
    • 1.5k views

  3. Dark matter 1 2 3 4 5

    By Kevin_Hall,
    • 100 replies
    • 7.6k views

  4. Orion below the horizon? Where am I going wrong please?

    By wotsallthis,
    • 4 replies
    • 824 views

  5. Cosmological redshift, another thought experiment

    By Genady,
    • 4 replies
    • 585 views

  6. We and cosmic scales

    By Genady,
    • 6 replies
    • 813 views

  7. Jobs

    By EdenFechter,
    • 0 replies
    • 591 views

  8. Cosmological redshift, thought experiment

    By Genady,
    • 18 replies
    • 1k views

  9. Is it easy to shade the Earth for cooling? 1 2

    By Kevin_Hall,
    • 26 replies
    • 2k views

  10. Start of time ?

    By Genady,
    • 9 replies
    • 785 views

  11. Rocket fuel

    By Kevin_Hall,
    • 8 replies
    • 845 views

  12. What is the mechanism for SPACE EXPANSION ?

    By Marius,
    • 15 replies
    • 1.4k views

  13. Does space have mass ? If not, how does it accelerate ?

    By Marius,
    • 20 replies
    • 1.3k views

  14. "Our space is curved" 1 2

    By Genady,
    • 33 replies
    • 2.9k views

  15. The Universe's First Molecule Found:

    By beecee,
    • 4 replies
    • 661 views

  16. What is the mechanism for the BIG BANG ?

    By Marius,
    • 13 replies
    • 794 views

  17. Happy New Year, astronauts!

    By Kevin_Hall,
    • 0 replies
    • 493 views

  18. Dark Matter:

    By beecee,
    • 6 replies
    • 1.1k views

  19. Could the real size of the universe be infinite? 1 2 3

    By Strange Me,
    • 71 replies
    • 6.3k views

  20. Do black holes have a centre?

    By geordief,
    • 22 replies
    • 1.3k views

  21. Naturally occurring elements heavier than U ?

    By Airbrush,
    • 6 replies
    • 1.4k views

  22. If the sun were to go red giant wouldn't it cause all planets to move as well?

    By inbreeding,
    • 9 replies
    • 1.4k views

  23. Atmosphere of Venus (split from An absolutely bonkers plan to give Mars an artificial magnetosphere)

    By Bufofrog,
    • 6 replies
    • 699 views

  24. Gravity wells determine orbital plane? 1 2

    By DeckerdSmeckerd,
    • 35 replies
    • 2.6k views

  25. Alone again?

    By geordief,
    • 8 replies
    • 906 views
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