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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3713 topics in this forum

  1. What are some massive black holes?

    By atom_cosmic10,
    • 5 replies
    • 1k views

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

    By PeterBushMan,
    • 1 reply
    • 651 views

  3. Asteroid defense ideas 1 2 3 4 11

    By Airbrush,
    • 268 replies
    • 12.5k views

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

    By MSC,
    • 5 replies
    • 908 views

  5. When did spacetime form? 1 2 3

    By geordief,
    • 55 replies
    • 4.1k views

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

    By AbstractDreamer,
    • 114 replies
    • 10k views

  7. small radio telescopes

    By sddfds,
    • 5 replies
    • 743 views

  8. Universe related questions

    By Bobdihi,
    • 1 reply
    • 548 views

  9. Big Bang starting reference point 1 2

    By bsolomon_us,
    • 30 replies
    • 1.4k views

  10. The black hole stars

    By atom_cosmic10,
    • 6 replies
    • 966 views

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

    By raphaelh42,
    • 2 replies
    • 343 views

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

    By geordief,
    • 1 reply
    • 449 views

  13. Space Expansion, wavelength and energy density

    By AbstractDreamer,
    • 7 replies
    • 1.1k views

  14. Sunshine on Titan 1 2

    By Gian,
    • 27 replies
    • 2.4k views

  15. Monolith asteroids: a Silent Order.

    By GeeKay,
    • 2 replies
    • 586 views

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

    By Chris Sawatsky,
    • 145 replies
    • 8.4k views

  17. Interview invitation for YouTube channel

    By Viktoriia,
    • 1 reply
    • 502 views

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

    By icarus2,
    • 12 replies
    • 1.1k views

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

    By tmdarkmatter,
    • 28 replies
    • 2k views

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

    By npts2020,
    • 16 replies
    • 991 views

  21. Novel Dark Matter & Energy Hypothesis

    By exchemist,
    • 1 reply
    • 468 views

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

    By Photon Guy,
    • 45 replies
    • 3.2k views

  23. Bringing Samples Back From Mars

    By Photon Guy,
    • 5 replies
    • 871 views

  24. Could we observe the present ? 1 2

    By Time Traveler,
    • 30 replies
    • 2.6k views

  25. Object faster or just as fast as light

    By Irma,
    • 16 replies
    • 1.6k views
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