Astronomy and Cosmology

3693 topics in this forum

1. Does dark energy obey the inverse-square law?

   By MarkE, June 28, 2021
   • 23 replies
   • 1.8k views
   • 
   • swansont
   • June 29, 2021

2. Could singularities be broken by space “pressure“?

   By Thoughtless, June 27, 2021
   • 3 replies
   • 803 views
   • 
   • Thoughtless
   • June 28, 2021

3. The strong force question/proposal

   By QuantumT, June 12, 2021
   • 5 replies
   • 1.3k views
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   • QuantumT
   • June 23, 2021

4. Appropriate Signal to Noise Ratio for CMB Measurements? (Wmap, Cobe, Planck)

   By The victorious truther, June 19, 2021
   • 0 replies
   • 633 views
   • 
   • The victorious truther
   • June 19, 2021

5. Interesting space facts

   By ethelbertmagnus, June 10, 2021
   • 2 replies
   • 728 views
   • 
   • beecee
   • June 10, 2021

6. How does General Relativity predict zero volume/infinite density of Black holes?

   By Nigel Denning, May 28, 2021
   • 2 replies
   • 793 views
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   • swansont
   • May 28, 2021

7. Dark matter mystery.

   By AlexandrKushnirtshuk, May 27, 2021
   • 3 replies
   • 865 views
   • 
   • Phi for All
   • May 27, 2021

8. Earth The Size Of A Tennis Ball

   By Photon Guy, March 1, 2021
   • 3 replies
   • 1.2k views
   • 
   • iNow
   • May 21, 2021

9. Space - Can Private Industry actually compete with China?

   By DeepSeaBase, May 11, 2021
   • 14 replies
   • 1.7k views
   • 
   • SpaceJac111
   • May 21, 2021

10. Space Travel - is it leisurely possible? (Can we tolerate risk?)

    By DeepSeaBase, May 11, 2021
    • 6 replies
    • 1.1k views
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    • beecee
    • May 20, 2021

11. Get ready for the landing of Perseverance ! 1 2

    By Airbrush, February 11, 2021
    • 35 replies
    • 4k views
    • 
    • SpaceJac111
    • May 20, 2021

12. The universe is flat? (split from Time for a different view)

    By MPMin, May 18, 2021
    • 19 replies
    • 1.6k views
    • 
    • studiot
    • May 20, 2021

13. Correspondence between mass/radius of both the observable universe and black holes

    By MarkE, May 12, 2021
    • 9 replies
    • 1k views
    • 
    • joigus
    • May 18, 2021

14. SpaceX 1 2 3 4 10

    By ThatSpaceBoy, April 16, 2021
    • 230 replies
    • 17.9k views
    • 
    • dimreepr
    • May 12, 2021

15. There may be 14 antimatter objects hiding in the Milky Way. These objects are called anti-stars.

    By SergUpstart, May 4, 2021
    • 8 replies
    • 1.4k views
    • 
    • swansont
    • May 5, 2021

16. Dark Matter and Suspiciously Warm Planets:

    By beecee, May 4, 2021
    • 1 reply
    • 707 views
    • 
    • beecee
    • May 5, 2021

17. False picture possible on optical telescopes

    By Yanosh, May 4, 2021
    • 3 replies
    • 808 views
    • 
    • beecee
    • May 4, 2021

18. New exoplanet candidate found in the habitable zone of the closest star system

    By USer2343, February 28, 2021
    • 7 replies
    • 1.3k views
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    • beecee
    • May 3, 2021

19. Russias submarine launched satellite

    By IDNeon, May 3, 2021
    • 2 replies
    • 730 views
    • 
    • Phi for All
    • May 3, 2021

20. April 12th: 1961.

    By beecee, April 9, 2021
    • 21 replies
    • 1.8k views
    • 
    • beecee
    • May 3, 2021

21. Paradox of visual and actual positions in space.

    By AlexandrKushnirtshuk, April 13, 2021
    • 8 replies
    • 1.2k views
    • 
    • IDNeon
    • May 3, 2021

22. Could you use Carbon Nanotube Yarn/Twistron Yarn and a black hole to theoretically create a Infinite Energy Source?

    By Liliander, April 27, 2021
    • 1 reply
    • 600 views
    • 
    • swansont
    • April 27, 2021

23. Crashing into Andromeda 1 2

    By wildie9, February 10, 2021
    • 41 replies
    • 5.9k views
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    • cannongray
    • April 27, 2021

24. Hill sphere shape

    By Zura, April 20, 2021
    • 7 replies
    • 1.1k views
    • 
    • Zura
    • April 20, 2021

25. First I heard of this! [Gotta have a giggle]

    By beecee, April 13, 2021
    • 1 reply
    • 672 views
    • 
    • beecee
    • April 13, 2021