Astronomy and Cosmology

3705 topics in this forum

1. If the Earth stopped spinning, would half the world..

   By InNeedOfHelp, December 28, 2012
   • 2 replies
   • 915 views
   • 
   • Bill Angel
   • December 28, 2012

2. Expanding Space Questions

   By Jeremy Mallin, December 26, 2012
   • 6 replies
   • 1.7k views
   • 
   • StringJunky
   • December 27, 2012

3. How did planets end up orbiting the sun?

   By Arjun Artro, December 7, 2012
   • 16 replies
   • 5.1k views
   • 
   • ox1111
   • December 23, 2012

4. Long space journeys; Solar radiation shielding

   By 25Hz, December 4, 2012
   • 6 replies
   • 1.7k views
   • 
   • mr.spaceman
   • December 22, 2012

5. explaining Jet Brightness / Power relation ?

   By Widdekind, December 17, 2012
   • 0 replies
   • 2.3k views
   • 
   • Widdekind
   • December 17, 2012

6. Octopole and Quadrupole planes w.r.t. CMBR?

   By cohen990, December 13, 2012
   • 1 reply
   • 856 views
   • 
   • ajb
   • December 15, 2012

7. Detecting rotation speed of Galaxies

   By mr.spaceman, December 14, 2012
   • 2 replies
   • 1.2k views
   • 
   • mr.spaceman
   • December 14, 2012

8. Looking for references

   By justinater22, December 5, 2012
   • 2 replies
   • 1k views
   • 
   • elnetrino
   • December 12, 2012

9. cosmic density perturbations grow with time ?

   By Widdekind, December 11, 2012
   • 0 replies
   • 678 views
   • 
   • Widdekind
   • December 11, 2012

10. Cosmic Recombination occurred when ?

    By Widdekind, November 24, 2012
    • 3 replies
    • 1.6k views
    • 
    • Widdekind
    • December 11, 2012

11. Is this one way to make a planet?

    By alpha2cen, December 7, 2012
    • 10 replies
    • 1.6k views
    • 
    • ACG52
    • December 8, 2012

12. What if Cosmic Structure ceased expanding?

    By Widdekind, December 1, 2012
    • 2 replies
    • 1.3k views
    • 
    • Widdekind
    • December 7, 2012

13. a couple questions about stars

    By brandoncotten, December 5, 2012
    • 14 replies
    • 2.4k views
    • 
    • mathematic
    • December 5, 2012

14. What exactly is Gravity? 1 2

    By Arjun Artro, November 30, 2012
    • 27 replies
    • 4.6k views
    • 
    • juanrga
    • December 5, 2012

15. Shape of the universe

    By FunkyAce07, August 12, 2012
    • 15 replies
    • 4.8k views
    • 
    • justinater22
    • December 5, 2012

16. Trying to understand Primordial Black holes

    By justinater22, December 2, 2012
    • 7 replies
    • 1.4k views
    • 
    • justinater22
    • December 4, 2012

17. Black holes and spin

    By Moontanman, November 28, 2012
    • 3 replies
    • 1.6k views
    • 
    • Airbrush
    • December 4, 2012

18. could dark matter be nothing; literally?

    By 36grit, November 13, 2012
    • 18 replies
    • 2.4k views
    • 
    • alpha2cen
    • December 3, 2012

19. What is Time? 1 2 3 4

    By Alan McDougall, July 2, 2012
    • 78 replies
    • 9.3k views
    • 
    • anotherfilthyape
    • December 1, 2012

20. Dark Matter - Historical Viewpoints

    By bastion, December 1, 2012
    • 2 replies
    • 760 views
    • 
    • bastion
    • December 1, 2012

21. WMAP polarization data vs. Quasar spectra?

    By Widdekind, December 1, 2012
    • 0 replies
    • 1k views
    • 
    • Widdekind
    • December 1, 2012

22. SNII create Deuterium?

    By Widdekind, November 30, 2012
    • 1 reply
    • 881 views
    • 
    • John Cuthber
    • December 1, 2012

23. Fluid Dynamics equations in Comoving Coords. ??

    By Widdekind, November 23, 2012
    • 2 replies
    • 2k views
    • 
    • juanrga
    • November 28, 2012

24. 3-body Problem

    By fvicaria, November 28, 2012
    • 0 replies
    • 675 views
    • 
    • fvicaria
    • November 28, 2012

25. Integrating Irregulars into Hubble Sequence ?

    By Widdekind, November 23, 2012
    • 0 replies
    • 868 views
    • 
    • Widdekind
    • November 23, 2012