Astronomy and Cosmology

3713 topics in this forum

1. Is the Universe perpetual and does the Universe observe the laws of Thermodynamics

   By petrushka.googol, October 5, 2013
   • 3 replies
   • 985 views
   • 
   • BearOfNH
   • October 6, 2013

2. The expanding universe and the speed of light.

   By Preserve, September 23, 2013
   • 20 replies
   • 2.7k views
   • 
   • Delbert
   • October 5, 2013

3. stars orbiting non-stars 1 2

   By Didymus, August 20, 2013
   • 29 replies
   • 4.3k views
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   • Sensei
   • October 5, 2013

4. "Shocking" video of comet ISON causes "panic"?!? 1 2 3

   By sevenseas, June 8, 2013
   • 53 replies
   • 51.2k views
   • 
   • Mr Monkeybat
   • October 3, 2013

5. Accelerating stars aging process

   By too-open-minded, September 25, 2013
   • 12 replies
   • 2.1k views
   • 
   • John Cuthber
   • September 30, 2013

6. The Faintest Stars

   By GeeKay, September 18, 2013
   • 5 replies
   • 1.2k views
   • 
   • GeeKay
   • September 26, 2013

7. The Event Horizon Questions

   By KryptaRax, September 1, 2013
   • 9 replies
   • 1.5k views
   • 
   • Delbert
   • September 14, 2013

8. Mining Asteroids 1 2

   By jfy1966, June 14, 2013
   • 46 replies
   • 5.4k views
   • 
   • Moonguy
   • September 12, 2013

9. Weakly Interacting Sub-eV Particles

   By Enthalpy, September 11, 2013
   • 0 replies
   • 701 views
   • 
   • Enthalpy
   • September 11, 2013

10. How to calculate the sun and moon's gravitional pull in the Earth ?

    By Bjarne, September 10, 2013
    • 4 replies
    • 1.4k views
    • 
    • swansont
    • September 10, 2013

11. Inertia forces in the rotating frame (then rotation rate depends on the radius)

    By valwebnik, September 5, 2013
    • 1 reply
    • 758 views
    • 
    • swansont
    • September 5, 2013

12. Sun's Life-cycle Questions

    By Z07, September 3, 2013
    • 1 reply
    • 1.2k views
    • 
    • mathematic
    • September 3, 2013

13. cosmological blue-shift before "Big Crunch" ?

    By Widdekind, September 1, 2013
    • 2 replies
    • 1.4k views
    • 
    • imatfaal
    • September 3, 2013

14. Neutron Stars - re 'Dragon's Egg'

    By GeeKay, August 16, 2013
    • 21 replies
    • 3.2k views
    • 
    • imatfaal
    • September 3, 2013

15. Changing Universal Constants

    By t-star, August 12, 2013
    • 5 replies
    • 2.2k views
    • 
    • hypervalent_iodine
    • August 25, 2013

16. Trans-Stellar Planets

    By Moonguy, August 19, 2013
    • 20 replies
    • 2.9k views
    • 
    • arc
    • August 24, 2013

17. Absolute coordinates in the univers

    By Edgard Neuman, August 12, 2013
    • 7 replies
    • 2.4k views
    • 
    • imatfaal
    • August 23, 2013

18. Where are the rings?

    By ccwebb, August 23, 2013
    • 1 reply
    • 1.6k views
    • 
    • Moontanman
    • August 23, 2013

19. Dark Matter and the Initial Mass Function

    By Widdekind, June 9, 2009
    • 9 replies
    • 2.4k views
    • 
    • Leif
    • August 22, 2013

20. The Creation and Maintenance of Large Scale Cosmic Electric Charge Gradients!

    By Leif, August 18, 2013
    • 21 replies
    • 2.9k views
    • 
    • Leif
    • August 21, 2013

21. Night is Earth's Shadow? Negative!

    By Hyun18, August 18, 2013
    • 14 replies
    • 3.1k views
    • 
    • imatfaal
    • August 19, 2013

22. CMB and the big bang

    By aaron_ironmonger, July 14, 2013
    • 9 replies
    • 2.2k views
    • 
    • Spyman
    • August 19, 2013

23. The Truth About Geometric Unity

    By sevensixtwo, August 18, 2013
    • 1 reply
    • 1.2k views
    • 
    • imatfaal
    • August 19, 2013

24. How are super-massive stars formed?

    By EWyatt, April 14, 2012
    • 22 replies
    • 5.3k views
    • 
    • a_lexios
    • August 14, 2013

25. Cool Astronomy Images (split from astronomy links)

    By Ponner, August 5, 2013
    • 4 replies
    • 1.2k views
    • 
    • Ponner
    • August 13, 2013