Astronomy and Cosmology

3713 topics in this forum

1. A telescope's Limiting Magnitude

   By GeeKay, February 20, 2016
   • 5 replies
   • 1.6k views
   • 
   • GeeKay
   • February 21, 2016

2. Collision during relatively fast interstellar travel

   By Ivan Tuzikov, February 16, 2016
   • 21 replies
   • 3.2k views
   • 
   • TakenItSeriously
   • February 19, 2016

3. Relative model of the universe 1 2

   By michel123456, February 7, 2016
   • 43 replies
   • 5k views
   • 
   • TakenItSeriously
   • February 15, 2016

4. Universe Expansion 1 2 3 4

   By David Levy, January 1, 2016
   • 84 replies
   • 9.6k views
   • 
   • swansont
   • February 13, 2016

5. Gravitational waves and time travel

   By petrushka.googol, February 13, 2016
   • 1 reply
   • 1.1k views
   • 
   • imatfaal
   • February 13, 2016

6. Our universe exists inside a black hole?

   By Greencanon, February 10, 2016
   • 10 replies
   • 2.1k views
   • 
   • Mordred
   • February 13, 2016

7. Detection of torchships by exhaust plume 1 2

   By Ivan Tuzikov, February 3, 2016
   • 34 replies
   • 3.4k views
   • 
   • Ivan Tuzikov
   • February 12, 2016

8. is astrology really a pseudoscience? [yes] 1 2

   By ark200, February 21, 2015
   • 39 replies
   • 6.2k views
   • 
   • Mordred
   • February 12, 2016

9. 19.4 earth masses of ice inside Saturn

   By granpa, February 9, 2016
   • 16 replies
   • 2.6k views
   • 
   • imatfaal
   • February 11, 2016

10. Confused about Solar Flares & CMEs

    By GeeKay, February 6, 2016
    • 6 replies
    • 1.3k views
    • 
    • GeeKay
    • February 9, 2016

11. answers to dark matter

    By abstractthinker, February 7, 2016
    • 3 replies
    • 889 views
    • 
    • imatfaal
    • February 7, 2016

12. Siamese Planet?

    By DrmDoc, February 5, 2016
    • 16 replies
    • 2.4k views
    • 
    • DrmDoc
    • February 6, 2016

13. The Paradigm of Types

    By types, February 6, 2016
    • 2 replies
    • 1.1k views
    • 
    • imatfaal
    • February 6, 2016

14. How long would it take to get to Ceres?

    By Kirin Eldridge, February 2, 2016
    • 3 replies
    • 12.2k views
    • 
    • imatfaal
    • February 2, 2016

15. Sun azimuth at Greenwich meridian...

    By Externet, February 2, 2016
    • 1 reply
    • 912 views
    • 
    • Endy0816
    • February 2, 2016

16. Outer space scanning

    By Ivan Tuzikov, January 4, 2016
    • 6 replies
    • 1.8k views
    • 
    • EdEarl
    • January 27, 2016

17. How are distances to a satellites measured?

    By Bjarne, January 19, 2016
    • 15 replies
    • 2k views
    • 
    • Enthalpy
    • January 21, 2016

18. CMB 1 2 3 4

    By David Levy, November 20, 2015
    • 88 replies
    • 13k views
    • 
    • swansont
    • January 20, 2016

19. Possibilities and Challenges of Space and Mankind?

    By yashrajkakkad, January 19, 2016
    • 1 reply
    • 972 views
    • 
    • Phi for All
    • January 19, 2016

20. Why would we expect an Anti-Universe to be detectable?

    By TakenItSeriously, January 7, 2016
    • 21 replies
    • 3.5k views
    • 
    • Strange
    • January 17, 2016

21. Rocky planets size

    By Moontanman, January 10, 2016
    • 9 replies
    • 1.6k views
    • 
    • Moontanman
    • January 12, 2016

22. Gravitational lensing of our locally imprinted CMB

    By Sorcerer, January 9, 2016
    • 4 replies
    • 1.2k views
    • 
    • Strange
    • January 10, 2016

23. What came first in spiral galaxy? 1 2 3

    By David Levy, December 13, 2015
    • 53 replies
    • 6.7k views
    • 
    • David Levy
    • January 8, 2016

24. Question regarding black holes

    By CWingfield, January 1, 2016
    • 7 replies
    • 1.4k views
    • 
    • CWingfield
    • January 2, 2016

25. What percentage of the universe is antimatter?

    By Sorcerer, December 18, 2015
    • 6 replies
    • 4.2k views
    • 
    • Strange
    • December 24, 2015