Astronomy and Cosmology

3708 topics in this forum

1. Evidence for Multiverse Found?

   By IM Egdall, August 7, 2013
   • 3 replies
   • 1.6k views
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   • Strange
   • August 7, 2013

2. If the universe is spatially finite and flat, could you fly 'out of space'?

   By Fanghur, July 28, 2013
   • 4 replies
   • 2.2k views
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   • Bill Angel
   • August 7, 2013

3. Why don't we feel like we are hanging backwards on earth??

   By Iwonderaboutthings, August 2, 2013
   • 10 replies
   • 3.2k views
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   • Iwonderaboutthings
   • August 7, 2013

4. Regarding the Big Bang...

   By Arevalo, June 27, 2013
   • 16 replies
   • 3k views
   • 
   • a_lexios
   • August 4, 2013

5. Universe expansion velocity question?

   By porsche11, July 7, 2013
   • 11 replies
   • 1.9k views
   • 
   • Iggy
   • August 2, 2013

6. Had they finished forming at the same time?

   By TransformerRobot, July 29, 2013
   • 11 replies
   • 1.4k views
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   • Airbrush
   • August 1, 2013

7. Calculating weight on different planets

   By BearOfNH, July 22, 2013
   • 5 replies
   • 6k views
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   • Moonguy
   • July 31, 2013

8. Telescopes

   By krash661, July 13, 2013
   • 2 replies
   • 947 views
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   • fresh
   • July 30, 2013

9. Why sky is Black at nights?

   By alinoroozi, July 22, 2013
   • 16 replies
   • 2.1k views
   • 
   • J.C.MacSwell
   • July 27, 2013

10. Can ETs Detect Voyager?

    By Airbrush, July 16, 2013
    • 14 replies
    • 1.8k views
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    • dimreepr
    • July 26, 2013

11. Orbiting direction of the asteroid belt ?

    By Externet, July 24, 2013
    • 2 replies
    • 1.2k views
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    • Airbrush
    • July 25, 2013

12. Were they closer to the sun?

    By TransformerRobot, July 24, 2013
    • 9 replies
    • 1.4k views
    • 
    • swansont
    • July 25, 2013

13. Extraterrestrial life virtually has to exist 1 2

    By Hypercube, May 28, 2008
    • 44 replies
    • 5.7k views
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    • zapatos
    • July 19, 2013

14. Comoving transformation

    By Edgard Neuman, July 19, 2013
    • 0 replies
    • 755 views
    • 
    • Edgard Neuman
    • July 19, 2013

15. Milky Way's Black Hole Munches On Supercooked Gas!

    By BrightQuark, June 27, 2013
    • 7 replies
    • 1.9k views
    • 
    • GeeKay
    • July 14, 2013

16. radio-ray bursters ??

    By Widdekind, July 13, 2013
    • 1 reply
    • 1.5k views
    • 
    • EdEarl
    • July 14, 2013

17. Just saw another UFO today an hour and a half ago.

    By Windevoid, July 12, 2013
    • 3 replies
    • 1.9k views
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    • swansont
    • July 12, 2013

18. White Holes

    By son of sun, October 8, 2012
    • 20 replies
    • 3.8k views
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    • Archimedes
    • July 6, 2013

19. Expansion, Light, Redshift and Dark Energy

    By Prophet12, July 3, 2013
    • 24 replies
    • 2.3k views
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    • hypervalent_iodine
    • July 4, 2013

20. Dark Matter and Galaxy size

    By J.C.MacSwell, June 29, 2013
    • 9 replies
    • 1.8k views
    • 
    • Archimedes
    • July 4, 2013

21. Iron and the Death of Stars

    By Preserve, June 21, 2013
    • 3 replies
    • 2k views
    • 
    • Archimedes
    • July 4, 2013

22. fusion in galaxy coronae ?

    By Widdekind, June 27, 2013
    • 2 replies
    • 980 views
    • 
    • Widdekind
    • July 3, 2013

23. How to work out the radius and diameter of the universe?

    By ShaneJ, June 4, 2013
    • 9 replies
    • 2k views
    • 
    • Delbert
    • July 2, 2013

24. How thick is our spiral arm?

    By Airbrush, June 25, 2013
    • 16 replies
    • 6.9k views
    • 
    • StringJunky
    • June 28, 2013

25. Shape of Universe 1 2

    By efanton, May 9, 2013
    • 35 replies
    • 4.7k views
    • 
    • BrightQuark
    • June 27, 2013