Astronomy and Cosmology

3708 topics in this forum

1. Is the universe collapsing. 1 2

   By derek w, March 14, 2013
   • 25 replies
   • 3.8k views
   • 
   • SplitInfinity
   • March 20, 2013

2. purpose of planets

   By Nader, July 29, 2017
   • 16 replies
   • 3.8k views
   • 
   • Phi for All
   • January 2, 2021

3. Ability for Human Life on Other Planets

   By apollo2011, October 2, 2004
   • 21 replies
   • 3.8k views
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   • ydoaPs
   • October 7, 2004

4. Does time go back before the Big Bang? 1 2

   By Martin, October 23, 2008
   • 25 replies
   • 3.8k views
   • 
   • aguy2
   • November 12, 2008

5. Do photons get absorbed by electrons and new ones remitted as they travel across the 1 2

   By eon_rider, July 29, 2005
   • 26 replies
   • 3.8k views
   • 
   • Norman Albers
   • March 20, 2006

6. Finite or infinite Universe 1 2

   By mr.spaceman, July 1, 2012
   • 25 replies
   • 3.8k views
   • 
   • mr.spaceman
   • July 4, 2012

7. the secret behind artificial gravity? 1 2

   By dstebbins, November 30, 2006
   • 31 replies
   • 3.8k views
   • 
   • entwined
   • December 29, 2006

8. White Holes

   By son of sun, October 8, 2012
   • 20 replies
   • 3.8k views
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   • Archimedes
   • July 6, 2013

9. Beyond spacetime 1 2

   By Ultimate Infinity, July 2, 2016
   • 25 replies
   • 3.8k views
   • 
   • ajb
   • July 4, 2016

10. Singularities 1 2

    By g2006, June 22, 2005
    • 27 replies
    • 3.8k views
    • 
    • danny8522003
    • July 18, 2005

11. measuring the speed of the Earth 1 2

    By gib65, December 4, 2006
    • 25 replies
    • 3.8k views
    • 
    • Wearden
    • March 4, 2007

12. Defining a Singularity

    By rigney, June 3, 2010
    • 23 replies
    • 3.8k views
    • 
    • ajb
    • June 21, 2010

13. Planet of the eternal solar eclipse

    By Fellow, January 9, 2004
    • 22 replies
    • 3.8k views
    • 
    • JaKiri
    • January 10, 2004

14. What is space made out of?

    By AlphaBeta, June 15, 2008
    • 22 replies
    • 3.8k views
    • 
    • Martin
    • June 22, 2008

15. Space is the ultimate antecedent 1 2

    By gwb, March 26, 2018
    • 32 replies
    • 3.8k views
    • 
    • Mordred
    • April 13, 2018

16. He could have signed his name

    By Martin, October 13, 2005
    • 22 replies
    • 3.8k views
    • 
    • Martin
    • November 16, 2005

17. Effect of collisions while travelling at relativistic speeds? 1 2

    By Fanghur, April 6, 2017
    • 26 replies
    • 3.7k views
    • 
    • KipIngram
    • May 25, 2017

18. Through the Wormhole - atoms = pixels

    By jkoenig00, November 15, 2010
    • 2 replies
    • 3.7k views
    • 
    • swansont
    • November 15, 2010

19. Earth's magnetic field 1 2

    By sunspot, February 17, 2006
    • 25 replies
    • 3.7k views
    • 
    • insane_alien
    • April 15, 2006

20. Heliocentric theory disproved

    By alanpartridge, March 11, 2011
    • 3 replies
    • 3.7k views
    • 
    • michel123456
    • October 17, 2011

21. Dyson Sphere 1 2

    By ydoaPs, July 31, 2005
    • 35 replies
    • 3.7k views
    • 
    • [Tycho?]
    • September 14, 2005

22. Evidence that Dark Matter is real stuff 1 2

    By Martin, August 17, 2006
    • 32 replies
    • 3.7k views
    • 
    • Martin
    • August 29, 2006

23. Hawking search for ET? How successful do you think it will be? 1 2

    By Robittybob1, July 21, 2015
    • 38 replies
    • 3.7k views
    • 
    • Moontanman
    • September 22, 2015

24. anti time

    By jamey2k9, February 19, 2009
    • 9 replies
    • 3.7k views
    • 
    • Airbrush
    • March 4, 2009

25. edge of the universe EXISTS 1 2

    By KholdStunner, March 26, 2005
    • 28 replies
    • 3.7k views
    • 
    • island
    • April 12, 2005