Astronomy and Cosmology

3708 topics in this forum

1. Speed of Time 1 2

   By Nevermore, September 16, 2004
   • 26 replies
   • 3.3k views
   • 
   • Nevermore
   • September 18, 2004

2. what is expanding?

   By Johanluus, June 1, 2010
   • 20 replies
   • 3.3k views
   • 
   • michel123456
   • June 6, 2010

3. What happen before the Big Bang? 1 2

   By LostLabyrinths, August 23, 2008
   • 30 replies
   • 3.3k views
   • 
   • Edtharan
   • August 26, 2008

4. photo of Mars rover at edge of crater taken from orbit

   By Martin, October 9, 2006
   • 20 replies
   • 3.3k views
   • 
   • grifter
   • October 27, 2007

5. Lunar eclipse 1 2

   By Jacques, February 20, 2008
   • 25 replies
   • 3.3k views
   • 
   • Norman Albers
   • February 24, 2008

6. time exists?

   By Guest danydrunk, May 3, 2004
   • 20 replies
   • 3.3k views
   • 
   • brokenbin
   • July 22, 2005

7. Any empty vacuum space light can not travel in the Universe? 1 2

   By alpha2cen, June 2, 2012
   • 32 replies
   • 3.3k views
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   • alpha2cen
   • June 14, 2012

8. Is it misleading to say "IN the universe" 1 2

   By Sorcerer, August 5, 2015
   • 27 replies
   • 3.3k views
   • 
   • jeffellis
   • October 14, 2015

9. How many stars do dwarf galaxies have?

   By seriously disabled, December 31, 2008
   • 6 replies
   • 3.3k views
   • 
   • NowThatWeKnow
   • January 29, 2009

10. Extra Solar Planet Detection

    By waitaminute, March 31, 2013
    • 23 replies
    • 3.3k views
    • 
    • ccwebb
    • April 8, 2013

11. hollow disk of space

    By michel123456, December 14, 2010
    • 16 replies
    • 3.3k views
    • 
    • Spyman
    • December 20, 2010

12. Part of the Big Bang perplexes me 1 2

    By gwb, March 16, 2018
    • 33 replies
    • 3.3k views
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    • Airbrush
    • March 28, 2018

13. Space

    By pink_trike, February 22, 2011
    • 17 replies
    • 3.3k views
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    • Aristarchus in Exile
    • October 22, 2011

14. Swartzchild Radius

    By BobbyJoeCool, September 22, 2005
    • 6 replies
    • 3.3k views
    • 
    • Martin
    • October 5, 2005

15. Hubble volume

    By ensonik, March 3, 2005
    • 8 replies
    • 3.3k views
    • 
    • swansont
    • March 23, 2005

16. Slingshot around gravitational bodies

    By aman, December 25, 2003
    • 12 replies
    • 3.3k views
    • 
    • pantheory
    • April 20, 2012

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

    By dad, April 11, 2016
    • 37 replies
    • 3.3k views
    • 
    • swansont
    • April 11, 2016

18. estimating Europa's ice-crust thickness

    By Widdekind, April 17, 2011
    • 3 replies
    • 3.3k views
    • 
    • Widdekind
    • April 24, 2011

19. When did spacetime form? 1 2 3

    By geordief, June 1
    • 55 replies
    • 3.3k views
    • 
    • joigus
    • June 15

20. Life on Earth TNG

    By MadScientist, October 13, 2004
    • 24 replies
    • 3.3k views
    • 
    • Ophiolite
    • October 26, 2004

21. looking at the solar system

    By michel123456, March 2, 2013
    • 11 replies
    • 3.3k views
    • 
    • StringJunky
    • December 28, 2014

22. civilization

    By MRlogic, September 27, 2010
    • 17 replies
    • 3.3k views
    • 
    • awlaskov
    • October 24, 2010

23. Swimming on the surface of Titan

    By Gian, October 28, 2014
    • 14 replies
    • 3.3k views
    • 
    • Gian
    • July 16, 2015

24. Tiangong-1 uncontrolled reentry

    By Cristiano, June 27, 2017
    • 10 replies
    • 3.3k views
    • 
    • mistermack
    • June 30, 2017

25. Dark Matter Question

    By foodchain, June 6, 2008
    • 24 replies
    • 3.2k views
    • 
    • Phi for All
    • June 12, 2008