Astronomy and Cosmology

3705 topics in this forum

1. what is the entropy of a black hole ?

   By devrimci_kürt, November 11, 2009
   • 8 replies
   • 1.4k views
   • 
   • ajb
   • November 13, 2009

2. Questions on Dark Energy...

   By rrw4rusty, September 30, 2009
   • 5 replies
   • 1.7k views
   • 
   • Tugrul
   • November 10, 2009

3. black holes and hawking

   By devrimci_kürt, November 10, 2009
   • 2 replies
   • 896 views
   • 
   • ajb
   • November 10, 2009

4. A Universe From Nothing 1 2 3

   By iNow, October 23, 2009
   • 56 replies
   • 9.3k views
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   • Sorcerer
   • November 7, 2009

5. Is a telescope's resolving power simply a function of it's light collecting ability?

   By mzatanoskas, November 7, 2009
   • 1 reply
   • 2k views
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   • ajb
   • November 7, 2009

6. Can someone explain the position of the Sun in this photograph?

   By mzatanoskas, November 6, 2009
   • 3 replies
   • 991 views
   • 
   • mzatanoskas
   • November 6, 2009

7. Simple alternative to Dark Energy

   By john hunter, November 5, 2009
   • 0 replies
   • 718 views
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   • john hunter
   • November 5, 2009

8. What would a perfect solar storm do to modern society?

   By bascule, November 3, 2009
   • 13 replies
   • 1.6k views
   • 
   • Mr Skeptic
   • November 4, 2009

9. How much of the celestial sphere do you see per 24hr as opposed to per year?

   By mzatanoskas, November 3, 2009
   • 4 replies
   • 880 views
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   • Sisyphus
   • November 3, 2009

10. Is nuclear fusion powering the sun technically just a theory?

    By Fanghur, October 31, 2009
    • 15 replies
    • 5k views
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    • bascule
    • November 2, 2009

11. Expanding universe: once again I am confused...

    By rrw4rusty, October 14, 2009
    • 9 replies
    • 1.7k views
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    • Sorcerer
    • November 2, 2009

12. Shiva impact crater 500 km diameter--bolide estim. 40 km diam

    By Martin, October 16, 2009
    • 6 replies
    • 2k views
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    • Widdekind
    • October 31, 2009

13. The Big Bounce

    By andywood, October 27, 2009
    • 4 replies
    • 1.2k views
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    • andywood
    • October 28, 2009

14. How is light generated/emitted from stars?

    By Starstruck, October 24, 2009
    • 7 replies
    • 1.2k views
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    • Caleb
    • October 27, 2009

15. Any good orrery software out there?

    By mzatanoskas, October 26, 2009
    • 5 replies
    • 2.6k views
    • 
    • mzatanoskas
    • October 27, 2009

16. Jupiter's Cloud Bands

    By Gareth56, October 16, 2009
    • 7 replies
    • 1.1k views
    • 
    • insane_alien
    • October 21, 2009

17. Solution of several astronomical riddles

    By Ivan Gorelik, October 19, 2009
    • 0 replies
    • 951 views
    • 
    • Ivan Gorelik
    • October 19, 2009

18. The Perpetual Black Donut Theory

    By Lkreyna2, October 19, 2009
    • 0 replies
    • 867 views
    • 
    • Lkreyna2
    • October 19, 2009

19. Membranes in hyperspace?

    By altairpilot, October 9, 2009
    • 2 replies
    • 1.5k views
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    • shawn77
    • October 17, 2009

20. Surgestions about the entropy of a pulsat.universe.

    By Christian Feldm, October 15, 2009
    • 0 replies
    • 758 views
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    • Christian Feldm
    • October 15, 2009

21. Location of VY CM

    By altairpilot, October 9, 2009
    • 15 replies
    • 2k views
    • 
    • Mr Skeptic
    • October 12, 2009

22. Saving the World

    By Airbrush, September 15, 2009
    • 13 replies
    • 2k views
    • 
    • Airbrush
    • October 10, 2009

23. Supermassive blackholes

    By The Peon, October 9, 2009
    • 1 reply
    • 754 views
    • 
    • Mr Skeptic
    • October 10, 2009

24. The End of Space/Parallel Universe

    By whatliesbeyond?, October 6, 2009
    • 2 replies
    • 1.2k views
    • 
    • iPeppers
    • October 7, 2009

25. questions about heliosphere

    By jamesgunasekera, October 5, 2009
    • 3 replies
    • 938 views
    • 
    • Ophiolite
    • October 5, 2009