Astronomy and Cosmology

3713 topics in this forum

1. Mars impacting Jupiter

   By Marcus MacGregor, June 4, 2011
   • 8 replies
   • 2.2k views
   • 
   • Marcus MacGregor
   • June 6, 2011

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

   By Widdekind, January 27, 2011
   • 15 replies
   • 3.8k views
   • 
   • J.C.MacSwell
   • June 5, 2011

3. varying fine structure constant

   By BJC, May 31, 2011
   • 4 replies
   • 2k views
   • 
   • JCP
   • June 4, 2011

4. Meteorite?

   By Twizeguy, June 3, 2011
   • 4 replies
   • 1.9k views
   • 
   • Airbrush
   • June 3, 2011

5. estimating IGM density from cooling curve (?)

   By Widdekind, May 31, 2011
   • 0 replies
   • 1.5k views
   • 
   • Widdekind
   • May 31, 2011

6. brown dwarfs negate big bang theory?

   By eisenfaust2009, April 1, 2011
   • 21 replies
   • 4.5k views
   • 
   • Spyman
   • May 30, 2011

7. Estimating Sun's Lifetime -- what's wrong ?

   By Widdekind, December 22, 2009
   • 7 replies
   • 2.1k views
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   • Widdekind
   • May 29, 2011

8. Matter, Anti Matter, and Dark Matter

   By Basi, May 27, 2011
   • 6 replies
   • 2.4k views
   • 
   • BJC
   • May 28, 2011

9. universal homogenization

   By lemur, May 24, 2011
   • 4 replies
   • 1.8k views
   • 
   • Widdekind
   • May 26, 2011

10. Missing mass of the universe found with x-rays

    By Realitycheck, May 25, 2011
    • 4 replies
    • 2k views
    • 
    • Widdekind
    • May 25, 2011

11. Primordial Nucleosynthesis in Rad.Dom'd Era ?

    By Widdekind, May 22, 2011
    • 2 replies
    • 1.1k views
    • 
    • Widdekind
    • May 24, 2011

12. Alpha Magnetic Spectrometer

    By Airbrush, May 16, 2011
    • 3 replies
    • 1.3k views
    • 
    • BJC
    • May 21, 2011

13. denser early Cosmos had high index of refraction ?

    By Widdekind, May 18, 2011
    • 4 replies
    • 1.5k views
    • 
    • BJC
    • May 19, 2011

14. Motion in Outer Space

    By Luna, April 21, 2011
    • 11 replies
    • 4k views
    • 
    • Ophiolite
    • May 18, 2011

15. 'New Arm' of Milky Way links to Perseus arm ??

    By Widdekind, May 18, 2011
    • 0 replies
    • 1.2k views
    • 
    • Widdekind
    • May 18, 2011

16. Dark Matter (Anti-Matter) 1 2

    By RedShift1121, May 3, 2011
    • 27 replies
    • 5.5k views
    • 
    • Spyman
    • May 18, 2011

17. My ameteur article

    By RedmanBrendan, May 17, 2011
    • 1 reply
    • 1.1k views
    • 
    • Realitycheck
    • May 17, 2011

18. Interstellar Gas

    By Dekan, May 16, 2011
    • 4 replies
    • 1.4k views
    • 
    • Airbrush
    • May 16, 2011

19. Space is not infinite. 1 2 3

    By jamiestem, April 16, 2011
    • 66 replies
    • 14.1k views
    • 
    • Snuttifronk
    • May 16, 2011

20. Sling-shotting Energy

    By Oddt, May 9, 2011
    • 11 replies
    • 2.6k views
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    • Spyman
    • May 14, 2011

21. Speaking of 2012.

    By Greatest I am, March 2, 2011
    • 9 replies
    • 2.4k views
    • 
    • MattyT
    • May 14, 2011

22. Rebang

    By 36grit, May 10, 2011
    • 6 replies
    • 1.5k views
    • 
    • 36grit
    • May 13, 2011

23. Are the iron remnants of supernovae mostly molecular in size or do we have substantial projectiles roaming around through space?

    By Realitycheck, April 3, 2011
    • 6 replies
    • 1.2k views
    • 
    • Realitycheck
    • May 13, 2011

24. What are the consequences of pole reversals on Earth?

    By Juryoku, May 11, 2011
    • 4 replies
    • 1.6k views
    • 
    • Airbrush
    • May 11, 2011

25. time and space

    By *puffy* japanisthebest, May 11, 2011
    • 1 reply
    • 1.6k views
    • 
    • Spyman
    • May 11, 2011