Astronomy and Cosmology

3708 topics in this forum

1. how big is the universe?

   By science fan, June 20, 2011
   • 18 replies
   • 3.7k views
   • 
   • csmyth3025
   • September 4, 2011

2. Sending out visible signals 1 2

   By MadScientist, November 12, 2004
   • 39 replies
   • 3.7k views
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   • 5614
   • December 8, 2004

3. Big Bang paradox

   By purintjp, May 8, 2009
   • 22 replies
   • 3.7k views
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   • purintjp
   • October 2, 2009

4. Crystal cube 3D maps of the universe

   By Martin, December 25, 2005
   • 2 replies
   • 3.7k views
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   • Martin
   • December 26, 2005

5. A definition of time 1 2

   By Greg H., June 4, 2012
   • 27 replies
   • 3.7k views
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   • alpha2cen
   • June 11, 2012

6. Universe Boundaries 1 2

   By T-Nemesis, August 1, 2005
   • 25 replies
   • 3.7k views
   • 
   • tomgwyther
   • September 15, 2005

7. do galaxies orbit

   By jamey2k9, January 29, 2009
   • 5 replies
   • 3.7k views
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   • Martin
   • January 30, 2009

8. Wondering whats at the core of our planet and sun.

   By mia4ever, March 26, 2010
   • 7 replies
   • 3.7k views
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   • Airbrush
   • March 27, 2010

9. Why do the earth spin araund the sun? 1 2

   By jonsson, September 28, 2009
   • 27 replies
   • 3.6k views
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   • swansont
   • September 24, 2010

10. Multiple universes

    By Onix, July 12, 2012
    • 24 replies
    • 3.6k views
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    • dapifo
    • July 27, 2012

11. Gas Giant Ignition

    By AtomSplitter, October 20, 2008
    • 24 replies
    • 3.6k views
    • 
    • Mr Skeptic
    • October 29, 2008

12. Trillion years old Universe ?

    By RawThinkTank, December 17, 2004
    • 20 replies
    • 3.6k views
    • 
    • RawThinkTank
    • January 2, 2005

13. 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, November 2, 2016
    • 30 replies
    • 3.6k views
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    • swansont
    • November 27, 2016

14. Why is the observable universe flat? 1 2

    By Raider5678, January 2, 2018
    • 26 replies
    • 3.6k views
    • 
    • Roamer
    • January 4, 2018

15. Maximum Size Of Solid Planet

    By Fellow, January 9, 2004
    • 21 replies
    • 3.6k views
    • 
    • aman
    • May 14, 2004

16. Do you truly believe modern scientists have written the end of this story? 1 2

    By OdinSon2k11, June 6, 2021
    • 41 replies
    • 3.6k views
    • 
    • Endy0816
    • August 3, 2021

17. The Universe shouldn't expand infinitely?

    By Гера�им, November 10, 2013
    • 21 replies
    • 3.6k views
    • 
    • Simpleton
    • December 10, 2013

18. Why didn't they catch Genenis in mid-air like planned? 1 2

    By Kedas, September 8, 2004
    • 32 replies
    • 3.6k views
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    • 5614
    • September 19, 2004

19. Does the Sun have an Orbit?

    By Equilibrium, January 11, 2011
    • 2 replies
    • 3.6k views
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    • alpha2cen
    • January 12, 2011

20. Earth like planets?

    By Cohen, June 10, 2004
    • 22 replies
    • 3.6k views
    • 
    • SolarFlare
    • September 19, 2004

21. Holding anti-matter 1 2

    By Dark matter, March 3, 2008
    • 32 replies
    • 3.6k views
    • 
    • antimatter
    • March 12, 2008

22. Reducing matter density would 'inflate' space-time?

    By Widdekind, January 27, 2011
    • 15 replies
    • 3.6k views
    • 
    • J.C.MacSwell
    • June 5, 2011

23. saturation point of light 1 2

    By stevebtaylor, March 30, 2010
    • 25 replies
    • 3.6k views
    • 
    • stevebtaylor
    • April 19, 2010

24. What temperature is space? 1 2

    By onemind, March 25, 2005
    • 34 replies
    • 3.6k views
    • 
    • J.C.MacSwell
    • March 28, 2005

25. No energy conservation in photon by E=hf (f↓) in space of expansion 1 2

    By Jinsuk Kim, November 22, 2018
    • 41 replies
    • 3.6k views
    • 
    • Strange
    • November 30, 2018