Astronomy and Cosmology

3708 topics in this forum

1. How would the force of gravity differ in an Antimatter Universe?

   By Alan McDougall, January 27, 2014
   • 8 replies
   • 1.4k views
   • 
   • Sensei
   • February 19, 2014

2. Why did the universe expand when it was small enough to be gravitationally bound?

   By Rolando, February 4, 2014
   • 6 replies
   • 2.1k views
   • 
   • Schneibster
   • February 18, 2014

3. Question: How is a gravitational singularity possible?

   By RadarArtillery, February 9, 2014
   • 12 replies
   • 1.9k views
   • 
   • hoola
   • February 12, 2014

4. Black holes emitting radiation

   By Mr. Healy, February 6, 2014
   • 13 replies
   • 1.9k views
   • 
   • Implicate Order
   • February 9, 2014

5. Zones of backward time

   By petrushka.googol, January 22, 2014
   • 16 replies
   • 2.3k views
   • 
   • swansont
   • February 5, 2014

6. The Light Paradox

   By M_Broz, February 5, 2014
   • 2 replies
   • 1.1k views
   • 
   • ajb
   • February 5, 2014

7. photographing stars

   By qaopm, August 16, 2013
   • 9 replies
   • 1.9k views
   • 
   • BearOfNH
   • February 2, 2014

8. Why does the temperature of the core and sufrace of the sun differ so much?

   By yyh020635, January 26, 2014
   • 4 replies
   • 1.1k views
   • 
   • Enthalpy
   • January 29, 2014

9. Where would we be without our moon?

   By ScienceLord, January 15, 2014
   • 14 replies
   • 2.5k views
   • 
   • doccortex
   • January 29, 2014

10. Drunk on Black Holes 1 2 3 4 5

    By decraig, November 20, 2013
    • 113 replies
    • 13.4k views
    • 
    • hypervalent_iodine
    • January 28, 2014

11. Free Astronomy/Science Info sources

    By Astronomy, January 26, 2014
    • 5 replies
    • 1.6k views
    • 
    • hypervalent_iodine
    • January 27, 2014

12. What is Trajectory Deflection Angle

    By Bjarne, January 26, 2014
    • 6 replies
    • 1.8k views
    • 
    • Bjarne
    • January 26, 2014

13. position & time from a picture of the sky. 1 2

    By michel123456, November 10, 2013
    • 28 replies
    • 5.9k views
    • 
    • michel123456
    • January 26, 2014

14. Black hole like simulation in a particle accelerator?

    By petrushka.googol, January 24, 2014
    • 3 replies
    • 1.1k views
    • 
    • Strange
    • January 26, 2014

15. Black holes gaining mass

    By Endercreeper01, January 4, 2014
    • 8 replies
    • 2k views
    • 
    • Strange
    • January 24, 2014

16. Your take on Antimatter and Our Universe?

    By Abhi_KS, December 26, 2013
    • 15 replies
    • 2.3k views
    • 
    • Jdaniel343
    • January 24, 2014

17. How realistically can we describe the early history of our universe?

    By petrushka.googol, January 23, 2014
    • 1 reply
    • 784 views
    • 
    • Strange
    • January 23, 2014

18. Rosetta probe...

    By Externet, January 21, 2014
    • 3 replies
    • 1.3k views
    • 
    • Enthalpy
    • January 22, 2014

19. Hubble looking at old galaxies

    By Jdaniel343, January 22, 2014
    • 2 replies
    • 944 views
    • 
    • Enthalpy
    • January 22, 2014

20. Expansion of the universe

    By azafran, January 21, 2014
    • 4 replies
    • 1.4k views
    • 
    • Spyman
    • January 21, 2014

21. Age of the Universe

    By Jdaniel343, January 17, 2014
    • 10 replies
    • 1.8k views
    • 
    • Jdaniel343
    • January 18, 2014

22. The big bang still happening? 1 2 3

    By too-open-minded, October 10, 2013
    • 51 replies
    • 7.5k views
    • 
    • Alan McDougall
    • January 14, 2014

23. Changing a spaceship's direction via ejecting mass 1 2

    By CyborgTriceratops, December 31, 2013
    • 35 replies
    • 3.6k views
    • 
    • Alan McDougall
    • January 9, 2014

24. Size of the Universe

    By Perkinsjc12, November 8, 2013
    • 6 replies
    • 1.7k views
    • 
    • Alan McDougall
    • January 4, 2014

25. Is the universe expanding/stretching or are we hurtling towards something?

    By FunkyAce07, January 1, 2014
    • 2 replies
    • 978 views
    • 
    • Alan McDougall
    • January 4, 2014