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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3686 topics in this forum

  1. Nature loves spirals

    By studiot,
    • 6 replies
    • 400 views

  2. What is the depth of the gravitational potential of the universe?

    By Halc,
    • 9 replies
    • 1.1k views

  3. How does the light from distant stars get to our eyes?

    By gib65,
    • 24 replies
    • 1.3k views

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

    By 34student,
    • 83 replies
    • 8.6k views

  5. Was the universe "dark" before the eyesight

    By vitttorrio,
    • 10 replies
    • 637 views

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

    By Mordred,
    • 0 replies
    • 392 views

  7. Mr

    By Edenjs,
    • 10 replies
    • 539 views

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

    By xX_minecraftMLGPRO2019_Xx,
    • 4 replies
    • 426 views

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

    By tmdarkmatter,
    • 50 replies
    • 2.2k views

  10. Hydrogen thermal equilibrium decoupling

    By Mordred,
    • 2 replies
    • 379 views

  11. Solar fusion, neutrinos and age of solar system

    By Sensei,
    • 10 replies
    • 2.6k views

  12. Revisiting the Kardashev Scale of Civilizations

    By Airbrush,
    • 0 replies
    • 357 views

  13. Will universe collapse?

    By vitttorrio,
    • 4 replies
    • 556 views

  14. Admiral Lord Nelson in Space

    By Gian,
    • 9 replies
    • 916 views

  15. Please, tell what objects

    By RomanRodinskiy,
    • 2 replies
    • 586 views

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

    By Gian,
    • 22 replies
    • 1.8k views

  17. astrophotography

    By sddfds,
    • 1 reply
    • 664 views

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

    By gatewood,
    • 157 replies
    • 11.1k views

  19. DART Mission

    By paulsutton,
    • 3 replies
    • 689 views

  20. Universal Expansion Alternative Theory

    By Charon,
    • 2 replies
    • 715 views

  21. Frank Drake (1930 - 2022)

    By toucana,
    • 1 reply
    • 664 views

  22. Big Bang theory 1 2 3

    By amshion,
    • 68 replies
    • 6k views

  23. I need help understanding something.

    By nonameyet,
    • 3 replies
    • 693 views

  24. 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
    • 1.6k views

  25. Stars revolving on the sky...

    By Externet,
    • 1 reply
    • 556 views
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