Astronomy and Cosmology

3712 topics in this forum

1. cosmic rays and the earths magnetosphere

   By petrushka.googol, November 2, 2013
   • 2 replies
   • 987 views
   • 
   • Enthalpy
   • November 2, 2013

2. Help with Friedman equations and density of energy

   By Helpsearcher, October 29, 2013
   • 2 replies
   • 1.7k views
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   • Helpsearcher
   • October 31, 2013

3. eccentricity of orbit

   By petrushka.googol, October 29, 2013
   • 5 replies
   • 2.1k views
   • 
   • Airbrush
   • October 31, 2013

4. Two comet system

   By petrushka.googol, October 29, 2013
   • 4 replies
   • 3.2k views
   • 
   • BusaDave9
   • October 30, 2013

5. About theories of gravity

   By spacecolonization.info, October 27, 2013
   • 4 replies
   • 1.3k views
   • 
   • spacecolonization.info
   • October 29, 2013

6. Are quasars made up of dark matter?

   By petrushka.googol, October 8, 2013
   • 12 replies
   • 2.8k views
   • 
   • ГераÑ�им
   • October 27, 2013

7. Limits of the Universe

   By petrushka.googol, October 19, 2013
   • 11 replies
   • 2.1k views
   • 
   • Airbrush
   • October 24, 2013

8. Comet Questions

   By riddlemethis, October 21, 2013
   • 2 replies
   • 983 views
   • 
   • Enthalpy
   • October 23, 2013

9. Does the idea of a "big bang" make any sense? 1 2 3

   By Windevoid, August 20, 2013
   • 57 replies
   • 7.5k views
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   • Airbrush
   • October 22, 2013

10. Arrow of time

    By petrushka.googol, October 21, 2013
    • 4 replies
    • 1.1k views
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    • swansont
    • October 21, 2013

11. Nebular hypothesis

    By Bilal Hussain, October 17, 2013
    • 10 replies
    • 1.8k views
    • 
    • Strange
    • October 21, 2013

12. Why the massive bodies curves space?

    By Гера�им, October 4, 2013
    • 7 replies
    • 1.9k views
    • 
    • Strange
    • October 21, 2013

13. Bing Bang Singularity?

    By BigBang, October 17, 2013
    • 3 replies
    • 1.8k views
    • 
    • BigBang
    • October 17, 2013

14. The origin of the universe

    By The Believer, October 16, 2013
    • 4 replies
    • 1.4k views
    • 
    • Strange
    • October 16, 2013

15. Accelerated movement of celestial bodies

    By too-open-minded, September 25, 2013
    • 13 replies
    • 2.2k views
    • 
    • Archimedes
    • October 15, 2013

16. universe

    By jobsbala, October 13, 2013
    • 4 replies
    • 1.2k views
    • 
    • Archimedes
    • October 14, 2013

17. Flat space time

    By petrushka.googol, October 10, 2013
    • 4 replies
    • 1.4k views
    • 
    • Deidre
    • October 13, 2013

18. Maximum size of solar system

    By petrushka.googol, October 11, 2013
    • 5 replies
    • 1.4k views
    • 
    • Archimedes
    • October 13, 2013

19. Do stars warp the energy fields of neighboring objects?

    By petrushka.googol, October 8, 2013
    • 2 replies
    • 950 views
    • 
    • BearOfNH
    • October 8, 2013

20. How to find gravitational waves?

    By Гера�им, October 7, 2013
    • 2 replies
    • 1k views
    • 
    • Airbrush
    • October 8, 2013

21. What is the order of magnitude of the mass of photons?

    By petrushka.googol, October 7, 2013
    • 1 reply
    • 944 views
    • 
    • swansont
    • October 7, 2013

22. Continuity of space

    By petrushka.googol, October 6, 2013
    • 3 replies
    • 1.2k views
    • 
    • mathematic
    • October 7, 2013

23. Did the universe have a beginning?

    By petrushka.googol, October 6, 2013
    • 1 reply
    • 1k views
    • 
    • Airbrush
    • October 6, 2013

24. Gravitational waves in space time continuum

    By petrushka.googol, October 6, 2013
    • 2 replies
    • 1.1k views
    • 
    • BusaDave9
    • October 6, 2013

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

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