Astronomy and Cosmology

3708 topics in this forum

1. Origins of the Universe 1 2

   By John316, October 16, 2015
   • 35 replies
   • 4.1k views
   • 
   • neutrinosalad
   • October 31, 2015

2. Hot Jupiters formed cold ?

   By Widdekind, September 22, 2011
   • 13 replies
   • 4.1k views
   • 
   • Widdekind
   • March 4, 2012

3. What percentage of the universe is antimatter?

   By Sorcerer, December 18, 2015
   • 6 replies
   • 4.1k views
   • 
   • Strange
   • December 24, 2015

4. The shape of light 1 2

   By cpwmatthews, May 26, 2006
   • 30 replies
   • 4.1k views
   • 
   • gcol
   • July 16, 2006

5. Why do planets form? 1 2

   By ensonik, March 3, 2005
   • 39 replies
   • 4.1k views
   • 
   • ensonik
   • March 10, 2005

6. How do we see "old" galaxies? 1 2

   By zapatos, May 18, 2010
   • 31 replies
   • 4.1k views
   • 
   • michel123456
   • June 9, 2010

7. LIGO Gravity waves 1 2

   By reerer, October 22, 2017
   • 45 replies
   • 4.1k views
   • 
   • Strange
   • October 31, 2017

8. Was The CMB Ever Visible?

   By Keydar, August 23, 2011
   • 7 replies
   • 4.1k views
   • 
   • MigL
   • August 25, 2011

9. Most Likely Ending

   By antimatter, April 2, 2009
   • 24 replies
   • 4.1k views
   • 
   • Airbrush
   • April 27, 2009

10. stars orbiting non-stars 1 2

    By Didymus, August 20, 2013
    • 29 replies
    • 4.1k views
    • 
    • Sensei
    • October 5, 2013

11. Black Holes 1 2

    By Paritosh Sontake, September 12, 2017
    • 44 replies
    • 4.1k views
    • 
    • Dubbelosix
    • September 30, 2017

12. Hard evidence for other universes?

    By Alexander1304, October 23, 2015
    • 21 replies
    • 4.1k views
    • 
    • imatfaal
    • December 3, 2015

13. What Exactly is the Fourth Dimension?

    By Arthur d. S. Jr., November 29, 2016
    • 24 replies
    • 4.1k views
    • 
    • AbstractDreamer
    • December 3, 2016

14. Polaris

    By SkyTeCh05, April 18, 2014
    • 23 replies
    • 4k views
    • 
    • SkyTeCh05
    • April 24, 2014

15. Surface Gravity Versus Centrifugal Force

    By Elen Sila, September 3, 2011
    • 15 replies
    • 4k views
    • 
    • Larry1957
    • November 17, 2011

16. effects of Metallicity on stars ?

    By Widdekind, August 23, 2011
    • 3 replies
    • 4k views
    • 
    • Enthalpy
    • September 2, 2011

17. Heavens Declare A Younger Solar System 1 2

    By ydoaPs, December 1, 2007
    • 34 replies
    • 4k views
    • 
    • losfomot
    • December 12, 2007

18. Expansion of Space vs Movement in Space 1 2

    By NowThatWeKnow, May 10, 2009
    • 31 replies
    • 4k views
    • 
    • Martin
    • May 26, 2009

19. Mysterious Force..

    By blike, July 20, 2002
    • 22 replies
    • 4k views
    • 
    • Radical Edward
    • April 9, 2003

20. Basic gravity questions

    By HeyNow, January 18, 2012
    • 5 replies
    • 4k views
    • 
    • Klaynos
    • January 25, 2012

21. 'Instability Strip' from fusion PP-to-CNO transition ?

    By Widdekind, August 6, 2011
    • 6 replies
    • 4k views
    • 
    • Enthalpy
    • September 29, 2015

22. Physical constants and the solar system 1 2

    By Roberts ratios, September 17, 2011
    • 25 replies
    • 4k views
    • 
    • John Cuthber
    • September 23, 2011

23. Black holes and the scarcity of anti-matter

    By baric, July 11, 2011
    • 22 replies
    • 4k views
    • 
    • baric
    • July 18, 2011

24. Chandra Shows Milky Way is Surrounded by Halo of Hot Gas 1 2

    By CaptainPanic, September 25, 2012
    • 27 replies
    • 4k views
    • 
    • Spyman
    • October 22, 2012

25. Could the big bang still be happening?

    By cameron marical, May 12, 2009
    • 10 replies
    • 4k views
    • 
    • timo
    • May 15, 2009