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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3712 topics in this forum

  1. What Exactly is the Fourth Dimension?

    By Arthur d. S. Jr.,
    • 24 replies
    • 4.2k views

  2. The Big Bang happened everywhere 1 2 3

    By substitutematerials,
    • 70 replies
    • 6.8k views

  3. Most common planetary system layout.

    By Quartofel,
    • 16 replies
    • 1.9k views

  4. A round trip around the universe.

    By geordief,
    • 11 replies
    • 1.7k views

  5. Questions on Redshift, Distance and Space Expansion 1 2

    By AbstractDreamer,
    • 27 replies
    • 3.4k views

  6. During inflation how did spacetime 'push' particles

    By Quantum321,
    • 23 replies
    • 2.6k views

  7. Can we accept as fact " that the universe is full of ' DARK ENERGY ' composed of a massive ,universe wide energy field composed of virtual particles ? 1 2

    By Mike Smith Cosmos,
    • 30 replies
    • 3.8k views

  8. Where Does Space End? It Must End Somewhere! 1 2 3 4 41

    By Edisonian,
    • 1k replies
    • 355.6k views

  9. A question about spacetravel

    By Kriss3d,
    • 5 replies
    • 1.4k views

  10. Riddle me this...

    By Butch,
    • 10 replies
    • 1.7k views

  11. Strange Stars

    By DrmDoc,
    • 6 replies
    • 1.2k views

  12. Help with entropy, arrow of time & things created from the vacuum

    By Jmanm,
    • 8 replies
    • 1.7k views

  13. Theoretically, could the universe have a center? 1 2

    By Sandro,
    • 31 replies
    • 3.6k views

  14. Martian Aurora: to see or not to see?

    By GeeKay,
    • 1 reply
    • 1k views

  15. how close a fit to LambdaCDM?

    By substitutematerials,
    • 9 replies
    • 2.2k views

  16. I need a 3D map of the universe out to 400 ly...suggestions?

    By rrw4rusty,
    • 4 replies
    • 1.9k views

  17. Astrospheres: the missing catalog and a proposal to make one

    By Jayson,
    • 10 replies
    • 1.6k views

  18. The rotation curve problem

    By Muser,
    • 1 reply
    • 1.2k views

  19. we are in early stage of big bang ,,and there would be a black whole in center of universe

    By qasimchef,
    • 5 replies
    • 1.5k views

  20. why there is no water om moon if,,,, it is aftermath of collision between earth and theia

    By qasimchef,
    • 2 replies
    • 921 views

  21. Could we detect an intrinsic change in the flow of time? 1 2

    By substitutematerials,
    • 37 replies
    • 3.5k views

  22. Anti-Space 1 2

    By æτhεr φ,
    • 30 replies
    • 14.4k views

  23. New universe? (split from could the universe have a center)

    By geordief,
    • 13 replies
    • 1.6k views

  24. The expanding Universe 1 2

    By Gian,
    • 30 replies
    • 4.4k views

  25. Why You Can't See Stars on the Moon ?

    By Captain Silver,
    • 3 replies
    • 1.1k views
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