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Astronomy and Cosmology

Topics related to observation of space and any related phenomena.

3705 topics in this forum

  1. Horava Gravity

    By Bill S,
    • 8 replies
    • 1.6k views

  2. Space before spacetime or not?

    By bogie,
    • 4 replies
    • 1.8k views

  3. Using Kepler's laws to find out various things about binary star systems

    By QuantumPerihelion,
    • 5 replies
    • 1.2k views

  4. Was the start of the Big Bang really the beginning of time?

    By Cosmo_Ken,
    • 14 replies
    • 1.7k views

  5. Could black holes create entire new universes?

    By Wil242424,
    • 6 replies
    • 1.3k views

  6. DIY Telescope that can see the universe

    By fluid,
    • 4 replies
    • 1.1k views

  7. Universal expansion, coordinate systems, time and the block universe

    By studiot,
    • 3 replies
    • 955 views

  8. One detail about the Big Bang that I am still not to clear on...

    By Excalibur0047,
    • 14 replies
    • 1.6k views

  9. Where are we 1 2 3 4

    By 36grit,
    • 75 replies
    • 8.3k views

  10. Expansion (split from quantification of space-time)

    By pittsburghjoe,
    • 1 reply
    • 989 views

  11. New Unifying Theory

    By ronnie33,
    • 6 replies
    • 1.6k views

  12. A Revised Unifying Theory. Is it any good?

    By Conway2,
    • 6 replies
    • 1.2k views

  13. Astronomers unveil most detailed map of the Milky Way to date

    By Sensei,
    • 7 replies
    • 1.3k views

  14. Hubble_constant_debate

    By es111,
    • 18 replies
    • 1.6k views

  15. Gravitational_lensing_sky_observations

    By es111,
    • 2 replies
    • 858 views

  16. A Unifying Theory

    By rstormview,
    • 1 reply
    • 1.1k views

  17. Could dark matter form planet sized objects?

    By imatfaal,
    • 9 replies
    • 1.3k views

  18. Planet Nine

    By Airbrush,
    • 6 replies
    • 1.4k views

  19. What Exactly is the Fourth Dimension?

    By Arthur d. S. Jr.,
    • 24 replies
    • 4k views

  20. The Big Bang happened everywhere 1 2 3

    By substitutematerials,
    • 70 replies
    • 6.2k views

  21. Most common planetary system layout.

    By Quartofel,
    • 16 replies
    • 1.7k views

  22. A round trip around the universe.

    By geordief,
    • 11 replies
    • 1.6k views

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

    By AbstractDreamer,
    • 27 replies
    • 3.1k views

  24. During inflation how did spacetime 'push' particles

    By Quantum321,
    • 23 replies
    • 2.4k views

  25. 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
    • 3.5k views
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