Astronomy and Cosmology

3712 topics in this forum

1. Matter/Energy and Space/Time

   By Airbrush, April 13, 2016
   • 1 reply
   • 1k views
   • 
   • Strange
   • April 13, 2016

2. what is time? 1 2 3

   By dad, April 11, 2016
   • 64 replies
   • 6.8k views
   • 
   • swansont
   • April 12, 2016

3. Dark Energy

   By surreptitious57, April 12, 2016
   • 1 reply
   • 994 views
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   • Mordred
   • April 12, 2016

4. Does time exist in the far universe? 1 2

   By dad, April 11, 2016
   • 37 replies
   • 3.5k views
   • 
   • swansont
   • April 11, 2016

5. Vacuum Energy Measurements Q

   By EdEarl, April 8, 2016
   • 3 replies
   • 867 views
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   • Mordred
   • April 8, 2016

6. Orbital patterns

   By j9mes, April 1, 2016
   • 8 replies
   • 1.9k views
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   • Janus
   • April 6, 2016

7. Orbit Dynamic Question

   By Bjarne, March 19, 2016
   • 6 replies
   • 1.3k views
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   • Enthalpy
   • April 6, 2016

8. Precession of the perihelion of earth

   By Bjarne, March 29, 2016
   • 1 reply
   • 1.2k views
   • 
   • Enthalpy
   • April 6, 2016

9. The beginning and end of the universe? 1 2

   By SimonFunnell, March 31, 2016
   • 29 replies
   • 4.3k views
   • 
   • hypervalent_iodine
   • April 6, 2016

10. Supernova Rate in Milky Way, why low?

    By EdEarl, March 26, 2016
    • 6 replies
    • 1.7k views
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    • Raider5678
    • March 30, 2016

11. Lambda-CDM (supposition vs. evidence)

    By shmengie, March 26, 2016
    • 14 replies
    • 2.1k views
    • 
    • Klaynos
    • March 27, 2016

12. Pet Peeves About Documentaries

    By Airbrush, March 8, 2016
    • 8 replies
    • 1.5k views
    • 
    • Airbrush
    • March 22, 2016

13. Are LIGO detectors the evolution of the Michelson Morley experiment?

    By shmengie, March 22, 2016
    • 1 reply
    • 823 views
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    • Strange
    • March 22, 2016

14. A habitable Planet... 1 2 3

    By Aigbusted, November 10, 2007
    • 60 replies
    • 8.6k views
    • 
    • Airbrush
    • March 11, 2016

15. Best books?

    By Deesk06, March 5, 2016
    • 8 replies
    • 2.2k views
    • 
    • Deesk06
    • March 9, 2016

16. Could we detect a Dyson Swarm?

    By 3blake7, March 8, 2016
    • 3 replies
    • 1.8k views
    • 
    • 3blake7
    • March 9, 2016

17. Matter out of black holes?

    By johnandrew, March 7, 2016
    • 8 replies
    • 1.8k views
    • 
    • johnandrew
    • March 8, 2016

18. The Paradox 1 2 3

    By David Levy, February 29, 2016
    • 56 replies
    • 7k views
    • 
    • Endy0816
    • March 8, 2016

19. space time

    By Andylee1, February 28, 2016
    • 2 replies
    • 1.1k views
    • 
    • Strange
    • February 28, 2016

20. New mass creation 1 2

    By David Levy, February 20, 2016
    • 40 replies
    • 5.6k views
    • 
    • David Levy
    • February 27, 2016

21. Search for signs of Intelligent ET's in the Solar System 1 2

    By Ivan Tuzikov, February 17, 2016
    • 29 replies
    • 3.2k views
    • 
    • Airbrush
    • February 25, 2016

22. Properties of Expansion

    By TakenItSeriously, February 18, 2016
    • 13 replies
    • 2.1k views
    • 
    • TakenItSeriously
    • February 23, 2016

23. What dates are accepted for the age of the Sun? 1 2 3 4 8

    By Robittybob1, February 9, 2016
    • 195 replies
    • 15.4k views
    • 
    • hypervalent_iodine
    • February 23, 2016

24. Star formation questions (split from age of sun)

    By David Levy, February 22, 2016
    • 3 replies
    • 1.1k views
    • 
    • swansont
    • February 23, 2016

25. A telescope's Limiting Magnitude

    By GeeKay, February 20, 2016
    • 5 replies
    • 1.5k views
    • 
    • GeeKay
    • February 21, 2016