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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3712 topics in this forum

  1. it is true, It required a 100 tons of lifting power for spacemen to landed the moon in 1969?

    By PeterBushMan,
    • 1 reply
    • 621 views

  2. Asteroid defense ideas 1 2 3 4 11

    By Airbrush,
    • 268 replies
    • 11.4k views

  3. Goldilocks time in the earlier universe; when could life have began?

    By MSC,
    • 5 replies
    • 846 views

  4. When did spacetime form? 1 2 3

    By geordief,
    • 55 replies
    • 3.9k views

  5. Cosmological Redshift and metric expansion 1 2 3 4 5

    By AbstractDreamer,
    • 114 replies
    • 9.3k views

  6. small radio telescopes

    By sddfds,
    • 5 replies
    • 714 views

  7. Universe related questions

    By Bobdihi,
    • 1 reply
    • 529 views

  8. Big Bang starting reference point 1 2

    By bsolomon_us,
    • 30 replies
    • 1.3k views

  9. The black hole stars

    By atom_cosmic10,
    • 6 replies
    • 899 views

  10. Why I saw the moon being ~twice size as usual?

    By raphaelh42,
    • 2 replies
    • 320 views

  11. What might things have looked like before the Higgs Field?

    By geordief,
    • 1 reply
    • 428 views

  12. Space Expansion, wavelength and energy density

    By AbstractDreamer,
    • 7 replies
    • 1.1k views

  13. Sunshine on Titan 1 2

    By Gian,
    • 27 replies
    • 2.2k views

  14. Monolith asteroids: a Silent Order.

    By GeeKay,
    • 2 replies
    • 554 views

  15. The Beginning of the Universe 1 2 3 4 6

    By Chris Sawatsky,
    • 145 replies
    • 7.7k views

  16. Interview invitation for YouTube channel

    By Viktoriia,
    • 1 reply
    • 477 views

  17. Gravitational effect and pressure of photons in Friedmann equation?

    By icarus2,
    • 12 replies
    • 1.1k views

  18. I really need your help with some calculations 1 2

    By tmdarkmatter,
    • 28 replies
    • 1.9k views

  19. Expansion of space- Split from: Alabama court - "Embryos are people"

    By npts2020,
    • 16 replies
    • 933 views

  20. Novel Dark Matter & Energy Hypothesis

    By exchemist,
    • 1 reply
    • 449 views

  21. Airlines And Other Private Companies Going Into The Space Industry 1 2

    By Photon Guy,
    • 45 replies
    • 3k views

  22. Bringing Samples Back From Mars

    By Photon Guy,
    • 5 replies
    • 815 views

  23. Could we observe the present ? 1 2

    By Time Traveler,
    • 30 replies
    • 2.5k views

  24. Object faster or just as fast as light

    By Irma,
    • 16 replies
    • 1.6k views

  25. Determining distance (split from Cosmic Megastructure Challenges Theories of the Universe

    By Luc Turpin,
    • 0 replies
    • 336 views
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