Astronomy and Cosmology

3685 topics in this forum

1. The Big Bang happened everywhere 1 2 3

   By substitutematerials, October 24, 2016
   • 70 replies
   • 5.9k views
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   • Strange
   • December 2, 2016

2. A centre of mass of the Universe. 1 2 3

   By geordief, June 24, 2018
   • 70 replies
   • 6.4k views
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   • Mordred
   • June 27, 2018

3. Dark Energy and Non-Conservative Forces 1 2 3

   By DLTherrien, July 6, 2018
   • 70 replies
   • 4.7k views
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   • DLTherrien
   • July 21, 2018

4. dark matter question 1 2 3

   By hoola, January 1, 2023
   • 70 replies
   • 2.7k views
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   • Mordred
   • January 27, 2023

5. Big Bang theory 1 2 3

   By amshion, October 17, 2021
   • 68 replies
   • 5.9k views
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   • Mitcher
   • September 4, 2022

6. Space expanding FTL 1 2 3

   By BlackHole, March 17, 2005
   • 66 replies
   • 7.4k views
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   • Spyman
   • April 6, 2005

7. Space is not infinite. 1 2 3

   By jamiestem, April 16, 2011
   • 66 replies
   • 12.5k views
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   • Snuttifronk
   • May 16, 2011

8. what we see 1 2 3

   By michel123456, November 13, 2011
   • 65 replies
   • 10.6k views
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   • md65536
   • November 28, 2011

9. Milky way galaxy mass vs. black hole mass 1 2 3

   By David Levy, January 24, 2015
   • 65 replies
   • 6.3k views
   • 
   • Strange
   • March 14, 2015

10. Expanding space needs surroundings to expand into. T or F. 1 2 3

    By Martin, January 19, 2008
    • 64 replies
    • 8k views
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    • Martin
    • October 5, 2008

11. what is time? 1 2 3

    By dad, April 11, 2016
    • 64 replies
    • 5.8k views
    • 
    • swansont
    • April 12, 2016

12. Is interstellar travel possible? 1 2 3

    By Dinokilla45, September 23, 2013
    • 64 replies
    • 9.7k views
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    • Phi for All
    • June 10, 2017

13. Big Bang not an instance of something from nothing? 1 2 3

    By Alfred001, July 26, 2017
    • 64 replies
    • 7k views
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    • Mordred
    • September 30, 2017

14. The universe could be infinite in spatial volume and matter content. T or F? 1 2 3

    By Martin, January 18, 2008
    • 61 replies
    • 9.3k views
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    • doG
    • April 18, 2008

15. Wierd paper about. Neutrinos 1 2 3

    By Bmpbmp1975, April 13, 2020
    • 61 replies
    • 4.5k views
    • 
    • Strange
    • April 14, 2020

16. Time Is of the Essence!!!! Technology Is Evolving!!! 1 2 3

    By Sostyles, January 30, 2006
    • 60 replies
    • 6.8k views
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    • Sayonara
    • February 9, 2006

17. Black holes in a Big Bang Universe? 1 2 3

    By Rolando, May 15, 2012
    • 60 replies
    • 5.2k views
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    • space noob
    • May 19, 2012

18. Basic Concepts of modern science 1 2 3

    By David Levy, March 11, 2015
    • 60 replies
    • 8k views
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    • pantheory
    • March 19, 2015

19. A habitable Planet... 1 2 3

    By Aigbusted, November 10, 2007
    • 60 replies
    • 7.7k views
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    • Airbrush
    • March 11, 2016

20. a flat universe? 1 2 3

    By infoseeker, March 5, 2005
    • 59 replies
    • 5.5k views
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    • crzykllrghst
    • March 25, 2005

21. Big Bang 1 2 3

    By arvin, March 30, 2007
    • 59 replies
    • 6.7k views
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    • Martin
    • April 19, 2007

22. I finally found an accurate article on the speed of universal expansion 1 2 3

    By Angelo, January 10, 2020
    • 58 replies
    • 24.7k views
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    • MaximT
    • January 16, 2020

23. Does the idea of a "big bang" make any sense? 1 2 3

    By Windevoid, August 20, 2013
    • 57 replies
    • 6.6k views
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    • Airbrush
    • October 22, 2013

24. Questions about black holes and the Hawking radiation. 1 2 3

    By lucks_021, April 14, 2019
    • 57 replies
    • 5.2k views
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    • beecee
    • April 19, 2019

25. Titan Inhabitable? 1 2 3

    By us.2u, November 30, 2004
    • 56 replies
    • 5.9k views
    • 
    • us.2u
    • January 4, 2005