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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3685 topics in this forum

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

    By Halc,
    • 9 replies
    • 1.1k views

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

    By gib65,
    • 24 replies
    • 1.2k views

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

    By 34student,
    • 83 replies
    • 8.5k views

  4. Was the universe "dark" before the eyesight

    By vitttorrio,
    • 10 replies
    • 634 views

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

    By Mordred,
    • 0 replies
    • 390 views

  6. Mr

    By Edenjs,
    • 10 replies
    • 533 views

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

    By xX_minecraftMLGPRO2019_Xx,
    • 4 replies
    • 425 views

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

    By tmdarkmatter,
    • 50 replies
    • 2.2k views

  9. Hydrogen thermal equilibrium decoupling

    By Mordred,
    • 2 replies
    • 378 views

  10. Solar fusion, neutrinos and age of solar system

    By Sensei,
    • 10 replies
    • 2.6k views

  11. Revisiting the Kardashev Scale of Civilizations

    By Airbrush,
    • 0 replies
    • 354 views

  12. Will universe collapse?

    By vitttorrio,
    • 4 replies
    • 555 views

  13. Admiral Lord Nelson in Space

    By Gian,
    • 9 replies
    • 913 views

  14. Please, tell what objects

    By RomanRodinskiy,
    • 2 replies
    • 583 views

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

    By Gian,
    • 22 replies
    • 1.8k views

  16. astrophotography

    By sddfds,
    • 1 reply
    • 662 views

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

    By gatewood,
    • 157 replies
    • 11.1k views

  18. DART Mission

    By paulsutton,
    • 3 replies
    • 686 views

  19. Universal Expansion Alternative Theory

    By Charon,
    • 2 replies
    • 713 views

  20. Frank Drake (1930 - 2022)

    By toucana,
    • 1 reply
    • 662 views

  21. Big Bang theory 1 2 3

    By amshion,
    • 68 replies
    • 6k views

  22. I need help understanding something.

    By nonameyet,
    • 3 replies
    • 690 views

  23. 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

  24. Stars revolving on the sky...

    By Externet,
    • 1 reply
    • 552 views

  25. Does cosmic expansion ever end?

    By geordief,
    • 7 replies
    • 822 views
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