Astronomy and Cosmology

3691 topics in this forum

1. Your Top 3 Fermi Paradox Solutions 1 2

   By Luminal, July 13, 2007
   • 27 replies
   • 4.2k views
   • 
   • h4tt3n
   • May 6, 2009

2. scale factor

   By michel123456, November 14, 2010
   • 3 replies
   • 4.2k views
   • 
   • michel123456
   • November 15, 2010

3. So if dark matter exists, what would it be made out of? 1 2

   By Buych778, September 18, 2014
   • 32 replies
   • 4.2k views
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   • Sorcerer
   • October 18, 2015

4. Exoplanet discoveries 1 2

   By Strange, December 27, 2017
   • 44 replies
   • 4.2k views
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   • Raider5678
   • January 12, 2018

5. Correct usage of terms: Topology vs topography

   By endtheme, September 8, 2008
   • 1 reply
   • 4.2k views
   • 
   • ajb
   • September 8, 2008

6. Extraterrestrials 1 2

   By Thrand, September 24, 2004
   • 34 replies
   • 4.2k views
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   • Sorcerer
   • October 24, 2004

7. Cyclic universe possible? Yes, it is not. 1 2

   By alt_f13, August 19, 2003
   • 30 replies
   • 4.2k views
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   • alt_f13
   • February 13, 2004

8. Center of the Universe? 1 2

   By Cmac22, January 23, 2008
   • 32 replies
   • 4.2k views
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   • Observer
   • February 8, 2008

9. Gas in a vacuum? 1 2

   By DarthDooku, July 28, 2004
   • 25 replies
   • 4.2k views
   • 
   • SurfSciGuy
   • August 4, 2004

10. How the heck did the universe begin? 1 2

    By MidnightFox, November 16, 2006
    • 35 replies
    • 4.2k views
    • 
    • jackson33
    • November 27, 2006

11. Substantivalism vs Relationism

    By blike, August 18, 2002
    • 6 replies
    • 4.1k views
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    • Clown
    • August 21, 2003

12. Nothing or something? 1 2

    By mr.spaceman, July 1, 2012
    • 32 replies
    • 4.1k views
    • 
    • hypervalent_iodine
    • July 9, 2012

13. heat from sun 1 2

    By Athena, February 17, 2011
    • 26 replies
    • 4.1k views
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    • Athena
    • February 21, 2011

14. time travel

    By The 321 Anomaly, July 15, 2011
    • 24 replies
    • 4.1k views
    • 
    • Aristarchus in Exile
    • October 20, 2011

15. A few thoughts on timeline & entropy 1 2

    By Djordje, March 16, 2011
    • 28 replies
    • 4.1k views
    • 
    • Djordje
    • March 21, 2011

16. why most of space videos & images are CGI?

    By Ganesh Ujwal, December 30, 2014
    • 14 replies
    • 4.1k views
    • 
    • MigL
    • January 2, 2015

17. Metric Expansion Questions

    By Luminal, August 21, 2007
    • 9 replies
    • 4.1k views
    • 
    • Martin
    • August 31, 2007

18. a baby in space? 1 2

    By devrimci_kürt, March 29, 2009
    • 27 replies
    • 4.1k views
    • 
    • J.C.MacSwell
    • May 29, 2009

19. Oh _ 1 2

    By matter, September 2, 2003
    • 29 replies
    • 4.1k views
    • 
    • m@
    • September 6, 2003

20. expansion of space 1 2

    By `hýsøŕ, June 18, 2014
    • 39 replies
    • 4.1k views
    • 
    • MigL
    • August 11, 2014

21. Holograms 1 2 3

    By PrimalMinister, September 24, 2018
    • 53 replies
    • 4k views
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    • Strange
    • October 22, 2018

22. Antimatter 1 2

    By skulldude, March 1, 2008
    • 38 replies
    • 4k views
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    • Klaynos
    • August 13, 2008

23. rotation of moon 1 2

    By spunnery, March 8, 2007
    • 39 replies
    • 4k views
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    • wilgory
    • March 21, 2007

24. How can we know the shape of the Universe? 1 2

    By Mag, January 23, 2008
    • 28 replies
    • 4k views
    • 
    • antimatter
    • May 6, 2008

25. Interesting, star older than the universe?? 1 2

    By 36grit, March 28, 2013
    • 35 replies
    • 4k views
    • 
    • Iggy
    • May 15, 2013