Astronomy and Cosmology

3708 topics in this forum

1. Validity of non-carbon based life

   By pnaermao, May 26, 2005
   • 7 replies
   • 1.5k views
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   • Ophiolite
   • May 27, 2005

2. Leap year problem?

   By YT2095, December 30, 2006
   • 6 replies
   • 1.5k views
   • 
   • swansont
   • January 3, 2007

3. moon Maria formed after tide-lock to earth ?

   By Widdekind, May 7, 2011
   • 0 replies
   • 1.5k views
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   • Widdekind
   • May 7, 2011

4. How reliable are estimates of asteroid mineral content?

   By Ken Fabian, August 6, 2017
   • 8 replies
   • 1.5k views
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   • Mordred
   • August 9, 2017

5. Star Magnitude Query

   By GeeKay, November 7, 2013
   • 5 replies
   • 1.5k views
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   • GeeKay
   • November 14, 2013

6. Exact time Earth completing its orbit around the Sun...

   By robotoidhuman, December 30, 2013
   • 5 replies
   • 1.5k views
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   • Janus
   • January 1, 2014

7. ????

   By rigney, June 7, 2010
   • 5 replies
   • 1.5k views
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   • rigney
   • June 7, 2010

8. Convection -- Forest Fires on Exoplanets ??

   By Widdekind, January 8, 2010
   • 5 replies
   • 1.5k views
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   • steevey
   • February 8, 2011

9. quick question on telescopes and stars

   By gebreab, September 10, 2012
   • 9 replies
   • 1.5k views
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   • Airbrush
   • September 14, 2012

10. A fractal universe?

    By Sorcerer, July 21, 2014
    • 6 replies
    • 1.5k views
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    • Sorcerer
    • July 26, 2014

11. Dark matter theory resolved or just a new theory? you be the judge

    By tbraun, August 30, 2009
    • 4 replies
    • 1.5k views
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    • Widdekind
    • September 19, 2009

12. The solar neighborhood

    By CaptainPanic, December 21, 2011
    • 3 replies
    • 1.5k views
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    • Moontanman
    • December 22, 2011

13. gravitation pull

    By mab, September 29, 2004
    • 8 replies
    • 1.5k views
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    • Severian
    • October 12, 2004

14. Am @ Bb?

    By aguy2, May 25, 2008
    • 6 replies
    • 1.5k views
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    • aguy2
    • May 26, 2008

15. How long does it take for Earth to orbit Moon as seen from Moon's perspective?

    By Nicholas Kang, March 8, 2017
    • 3 replies
    • 1.5k views
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    • Argent
    • March 8, 2017

16. The Sun and its Gravity

    By Johnny5, April 1, 2005
    • 10 replies
    • 1.5k views
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    • Johnny5
    • April 1, 2005

17. Aigbusted's "habitable planet" question

    By Martin, December 28, 2007
    • 9 replies
    • 1.5k views
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    • Martin
    • December 31, 2007

18. Colliding satellites

    By Jacques, February 12, 2009
    • 11 replies
    • 1.5k views
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    • DrDNA
    • February 26, 2009

19. 67P as an apple core

    By Enthalpy, February 17, 2015
    • 2 replies
    • 1.5k views
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    • Enthalpy
    • September 29, 2015

20. I need help understanding the "celestial sphere"

    By Johnny5, April 27, 2005
    • 10 replies
    • 1.5k views
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    • Johnny5
    • April 28, 2005

21. Observable Universe and Cosmological Principle

    By the asinine cretin, May 31, 2012
    • 10 replies
    • 1.5k views
    • 
    • Alan McDougall
    • August 16, 2012

22. Huge amount of Dark Energy that Can't be seen... Why?

    By Lightmeow, March 8, 2014
    • 7 replies
    • 1.5k views
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    • mathematic
    • March 9, 2014

23. Super-massive Black holes: What's the mystery?

    By jryan, April 8, 2010
    • 6 replies
    • 1.5k views
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    • Airbrush
    • April 10, 2010

24. Universe expansion

    By secondtrooper, October 22, 2015
    • 5 replies
    • 1.5k views
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    • Endy0816
    • October 22, 2015

25. CMBR- How long ago are we observing?

    By Sorcerer, March 30, 2015
    • 8 replies
    • 1.5k views
    • 
    • Strange
    • April 1, 2015