Astronomy and Cosmology

3708 topics in this forum

1. lightcone calculator compatibility test

   By Mordred, May 7, 2014
   • 4 replies
   • 1.2k views
   • 
   • Mordred
   • May 8, 2014

2. Precession of the perihelion of earth

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

3. A Revised Unifying Theory. Is it any good?

   By Conway2, December 10, 2016
   • 6 replies
   • 1.2k views
   • 
   • Strange
   • December 10, 2016

4. Binary Systems orbits

   By Romron, March 28, 2014
   • 3 replies
   • 1.2k views
   • 
   • Cosmobrain
   • March 31, 2014

5. Upper limit on star mass

   By luc, February 4, 2005
   • 3 replies
   • 1.2k views
   • 
   • Martin
   • February 6, 2005

6. New goldilocks planet found dubbed the name Planet G!

   By moonjelly<3, March 9, 2012
   • 3 replies
   • 1.2k views
   • 
   • Widdekind
   • March 10, 2012

7. Eridanus Super Void

   By 36grit, March 4, 2014
   • 3 replies
   • 1.2k views
   • 
   • Greg H.
   • March 5, 2014

8. universe as a system

   By paragaster, February 27, 2017
   • 4 replies
   • 1.2k views
   • 
   • mathematic
   • March 2, 2017

9. How singularity in black hole works?

   By Eren, October 6, 2017
   • 5 replies
   • 1.2k views
   • 
   • Endy0816
   • October 7, 2017

10. Gravity and Galaxies

    By foodchain, October 20, 2007
    • 2 replies
    • 1.2k views
    • 
    • Spyman
    • October 22, 2007

11. Orbit Dynamic Question

    By Bjarne, March 19, 2016
    • 6 replies
    • 1.2k views
    • 
    • Enthalpy
    • April 6, 2016

12. Detecting rotation speed of Galaxies

    By mr.spaceman, December 14, 2012
    • 2 replies
    • 1.2k views
    • 
    • mr.spaceman
    • December 14, 2012

13. Dwarf Planet Ceres...

    By Orion1, August 31, 2015
    • 4 replies
    • 1.2k views
    • 
    • Janus
    • November 2, 2017

14. Ch-ch-changes

    By EnjoyItClem, August 11, 2008
    • 4 replies
    • 1.2k views
    • 
    • D H
    • August 11, 2008

15. what happened to...

    By japan rocks/andromeda, April 20, 2010
    • 3 replies
    • 1.2k views
    • 
    • Airbrush
    • April 22, 2010

16. Q: re: simple Newtonian System-Mass estimator ?

    By Widdekind, January 16, 2011
    • 0 replies
    • 1.2k views
    • 
    • Widdekind
    • January 16, 2011

17. Elusive Dark Matter

    By ronians1, February 19, 2013
    • 5 replies
    • 1.2k views
    • 
    • imatfaal
    • February 20, 2013

18. time and dimensions

    By awlaskov, October 25, 2010
    • 2 replies
    • 1.2k views
    • 
    • lemur
    • October 31, 2010

19. Solar radiation and Earth orbit

    By alpha2cen, February 6, 2011
    • 2 replies
    • 1.2k views
    • 
    • D H
    • February 6, 2011

20. % of dark matter in a 6 billion years old universe

    By Dynamotime, December 1, 2011
    • 1 reply
    • 1.2k views
    • 
    • Dynamotime
    • December 3, 2011

21. How density is related to Gravity ??

    By Anand7sem, February 19, 2014
    • 5 replies
    • 1.2k views
    • 
    • Greg H.
    • February 19, 2014

22. Stupid astronomy 101 question

    By Realitycheck, May 7, 2008
    • 7 replies
    • 1.2k views
    • 
    • Janus
    • May 11, 2008

23. Orbiting direction of the asteroid belt ?

    By Externet, July 24, 2013
    • 2 replies
    • 1.2k views
    • 
    • Airbrush
    • July 25, 2013

24. Modelling Astrophysical Phenomena

    By Royston, March 25, 2012
    • 2 replies
    • 1.2k views
    • 
    • Royston
    • March 28, 2012

25. Is space a property of matter?

    By Hashirama_Senju, February 23, 2014
    • 4 replies
    • 1.2k views
    • 
    • Strange
    • February 24, 2014