Astronomy and Cosmology

3705 topics in this forum

1. What's the dealio with the heliosphere?

   By GrandMasterK, December 2, 2015
   • 4 replies
   • 1.4k views
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   • Ophiolite
   • December 3, 2015

2. Hard evidence for other universes?

   By Alexander1304, October 23, 2015
   • 21 replies
   • 4k views
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   • imatfaal
   • December 3, 2015

3. What elements, minerals, or just molecules do star forming ' MOLECULAR GAS CLOUDS' contain , as they start a Star Birth? 1 2

   By Mike Smith Cosmos, November 17, 2015
   • 42 replies
   • 5.1k views
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   • Mike Smith Cosmos
   • November 30, 2015

4. Roche Limit Query

   By GeeKay, November 10, 2015
   • 5 replies
   • 2k views
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   • imatfaal
   • November 18, 2015

5. One Way Trip to Mars

   By houshasei, November 7, 2015
   • 7 replies
   • 1.8k views
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   • Airbrush
   • November 14, 2015

6. Universe contracting 1 2

   By pastori, October 31, 2015
   • 49 replies
   • 5k views
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   • michel123456
   • November 13, 2015

7. expanding universe conundrum

   By emil, November 12, 2015
   • 4 replies
   • 1.4k views
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   • Strange
   • November 13, 2015

8. A theory on the Universe expanding

   By Skins, November 10, 2015
   • 7 replies
   • 1.4k views
   • 
   • Skins
   • November 11, 2015

9. Dark Matter vs. Magnetism

   By ccwebb, October 14, 2015
   • 14 replies
   • 2.5k views
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   • Phi for All
   • November 10, 2015

10. Unruh Radiation

    By Quetzalcoatl, November 4, 2015
    • 7 replies
    • 1.7k views
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    • Quetzalcoatl
    • November 10, 2015

11. Rate of expansion of the Universe

    By petrushka.googol, October 18, 2015
    • 2 replies
    • 1.2k views
    • 
    • Mordred
    • November 10, 2015

12. Planetary wobble

    By petrushka.googol, October 25, 2015
    • 3 replies
    • 1.1k views
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    • Ophiolite
    • November 2, 2015

13. No big bang?

    By Sorcerer, October 29, 2015
    • 11 replies
    • 1.7k views
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    • Sorcerer
    • October 31, 2015

14. Origins of the Universe 1 2

    By John316, October 16, 2015
    • 35 replies
    • 4k views
    • 
    • neutrinosalad
    • October 31, 2015

15. The First Photon

    By petrushka.googol, October 30, 2015
    • 3 replies
    • 1.1k views
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    • pavelcherepan
    • October 31, 2015

16. determining semiminor axis in elliptic orbit

    By h4tt3n, March 2, 2006
    • 17 replies
    • 8.1k views
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    • Smashinbedrock
    • October 28, 2015

17. How to give a spacecraft a translation motion at constant mass.

    By Maximillian, October 27, 2015
    • 4 replies
    • 1.1k views
    • 
    • Strange
    • October 27, 2015

18. Universe expansion

    By secondtrooper, October 22, 2015
    • 5 replies
    • 1.4k views
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    • Endy0816
    • October 22, 2015

19. is comoving radial distance of universe = cmb radius ?

    By stephaneww, October 20, 2015
    • 0 replies
    • 904 views
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    • stephaneww
    • October 20, 2015

20. Dark matter in higher dimensional space.

    By Sorcerer, October 17, 2015
    • 11 replies
    • 1.8k views
    • 
    • Bill Angel
    • October 19, 2015

21. Any Intelligent Life on Earth? 1 2

    By Airbrush, August 21, 2014
    • 33 replies
    • 4.1k views
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    • Sorcerer
    • October 18, 2015

22. Universe from nothing vs Mirror Universe

    By Sorcerer, October 18, 2015
    • 2 replies
    • 1k views
    • 
    • Sorcerer
    • October 18, 2015

23. Some thoughts concerning search for extra-terrestrials 1 2

    By Ivan Tuzikov, August 8, 2015
    • 38 replies
    • 3.4k views
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    • Robittybob1
    • October 18, 2015

24. So if dark matter exists, what would it be made out of? 1 2

    By Buych778, September 18, 2014
    • 32 replies
    • 4.3k views
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    • Sorcerer
    • October 18, 2015

25. Did wars helped us advance in technology? 1 2

    By jagadeesh, April 3, 2015
    • 25 replies
    • 4.1k views
    • 
    • pavelcherepan
    • October 15, 2015