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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3708 topics in this forum

  1. Why is a fine-tuned universe a problem? 1 2 3 4

    By 34student,
    • 83 replies
    • 9.5k views

  2. Was the universe "dark" before the eyesight

    By vitttorrio,
    • 10 replies
    • 829 views

  3. Musings of a mad scientist (inflation as cosmological constant)

    By Mordred,
    • 0 replies
    • 498 views

  4. Mr

    By Edenjs,
    • 10 replies
    • 677 views

  5. Dark energy with negative and positive kinetic energy and the Big Rip

    By xX_minecraftMLGPRO2019_Xx,
    • 4 replies
    • 522 views

  6. Did the bing bang actually happen? 1 2 3

    By tmdarkmatter,
    • 50 replies
    • 2.8k views

  7. Hydrogen thermal equilibrium decoupling

    By Mordred,
    • 2 replies
    • 458 views

  8. Solar fusion, neutrinos and age of solar system

    By Sensei,
    • 10 replies
    • 2.8k views

  9. Revisiting the Kardashev Scale of Civilizations

    By Airbrush,
    • 0 replies
    • 445 views

  10. Will universe collapse?

    By vitttorrio,
    • 4 replies
    • 699 views

  11. Admiral Lord Nelson in Space

    By Gian,
    • 9 replies
    • 1.1k views

  12. Please, tell what objects

    By RomanRodinskiy,
    • 2 replies
    • 715 views

  13. The Total Perspective Vortex, Astrology and one small piece of fairy cake

    By Gian,
    • 22 replies
    • 2.2k views

  14. astrophotography

    By sddfds,
    • 1 reply
    • 802 views

  15. State of "matter" of a singularity 1 2 3 4 7

    By gatewood,
    • 157 replies
    • 12.6k views

  16. DART Mission

    By paulsutton,
    • 3 replies
    • 784 views

  17. Universal Expansion Alternative Theory

    By Charon,
    • 2 replies
    • 798 views

  18. Frank Drake (1930 - 2022)

    By toucana,
    • 1 reply
    • 758 views

  19. Big Bang theory 1 2 3

    By amshion,
    • 68 replies
    • 6.9k views

  20. I need help understanding something.

    By nonameyet,
    • 3 replies
    • 816 views

  21. are we trying to look out of a black hole when trying to look at the past of the big bang ?

    By raphaelh42,
    • 13 replies
    • 1.8k views

  22. Stars revolving on the sky...

    By Externet,
    • 1 reply
    • 617 views

  23. Does cosmic expansion ever end?

    By geordief,
    • 7 replies
    • 944 views

  24. Planetary atmospheres

    By Moontanman,
    • 16 replies
    • 1.1k views

  25. Living away from earth (split from Mars gravity issue) 1 2

    By mistermack,
    • 28 replies
    • 3.1k views
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