Astronomy and Cosmology

3685 topics in this forum

1. Suppose that I am looking in my telescope to a distant star 1 2 3 4 6

   By michel123456, November 22, 2014
   • 140 replies
   • 12.5k views
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   • Ophiolite
   • December 20, 2014

2. Field Question 1 2 3 4 7

   By MikeAL, May 4, 2018
   • 151 replies
   • 12.5k views
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   • MikeAL
   • May 9, 2018

3. Drunk on Black Holes 1 2 3 4 5

   By decraig, November 20, 2013
   • 113 replies
   • 12.4k views
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   • hypervalent_iodine
   • January 28, 2014

4. Why do bigger planets have shorter days?

   By dstebbins, August 26, 2011
   • 3 replies
   • 12.3k views
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   • khaled
   • September 5, 2011

5. what is the universe expanding into? 1 2 3 4 5

   By cameron marical, January 24, 2009
   • 105 replies
   • 12.1k views
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   • Martin
   • March 30, 2009

6. Theory of the earth's inclination 1 2 3 4

   By mooeypoo, June 5, 2004
   • 83 replies
   • 12.1k views
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   • us.2u
   • November 29, 2004

7. Is the amount of matter+energy of Universe constant? 1 2

   By dapifo, July 25, 2012
   • 25 replies
   • 12k views
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   • dapifo
   • April 7, 2014

8. How long would it take to get to Ceres?

   By Kirin Eldridge, February 2, 2016
   • 3 replies
   • 11.5k views
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   • imatfaal
   • February 2, 2016

9. CMB 1 2 3 4

   By David Levy, November 20, 2015
   • 88 replies
   • 11.3k views
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   • swansont
   • January 20, 2016

10. Universe expansion 1 2 3 4

    By justinater22, December 3, 2012
    • 91 replies
    • 11.2k views
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    • swansont
    • January 4, 2013

11. Why is a full moon best seen at noon?

    By John Salerno, August 8, 2010
    • 14 replies
    • 11.2k views
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    • needimprovement
    • September 3, 2010

12. GM - standard gravitational parameter...?

    By h4tt3n, November 5, 2005
    • 2 replies
    • 11.2k views
    • 
    • tony873004
    • November 6, 2005

13. What would happen if Earths magnetic field turned off?

    By Inquisitor, March 27, 2009
    • 23 replies
    • 11.1k views
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    • rebelion
    • April 19, 2009

14. State of "matter" of a singularity 1 2 3 4 7

    By gatewood, June 21, 2021
    • 157 replies
    • 11k views
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    • Mitcher
    • October 1, 2022

15. Size a solution to Fermi Paradox? 1 2 3 4

    By coderage9100, November 16, 2018
    • 98 replies
    • 11k views
    • 
    • dimreepr
    • December 24, 2019

16. Terraforming nearby planets 1 2 3 4

    By TransformerRobot, May 23, 2012
    • 93 replies
    • 10.9k views
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    • D H
    • June 24, 2012

17. Can a Virus survive in space? Random thoughts

    By Law, February 17, 2010
    • 9 replies
    • 10.7k views
    • 
    • Mr Skeptic
    • February 19, 2010

18. what we see 1 2 3

    By michel123456, November 13, 2011
    • 65 replies
    • 10.6k views
    • 
    • md65536
    • November 28, 2011

19. origin of hydrogen

    By alexsciri, October 22, 2007
    • 16 replies
    • 10.5k views
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    • DrDNA
    • October 24, 2007

20. First real Black Hole image - 10 April 2019 1 2 3 4 5

    By Elendirs, April 8, 2019
    • 121 replies
    • 10.4k views
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    • Strange
    • July 12, 2019

21. Univers Inside a black hole 1 2 3 4 5

    By Edgard Neuman, April 19, 2014
    • 107 replies
    • 10.4k views
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    • Mordred
    • June 20, 2014

22. Relationship between Planets size, mass, age and gravity?

    By Illuminati, March 19, 2006
    • 10 replies
    • 10k views
    • 
    • [Tycho?]
    • March 22, 2006

23. Vector theory of Gravity 1 2 3 4 6

    By coffeesippin, November 20, 2018
    • 126 replies
    • 9.9k views
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    • beecee
    • January 12, 2019

24. Can the speed of SOUND actually slow down?

    By japan rocks/andromeda, April 21, 2010
    • 21 replies
    • 9.9k views
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    • michel123456
    • April 25, 2010

25. Escape velocity for solar system and galaxy

    By Baby Astronaut, May 6, 2009
    • 13 replies
    • 9.9k views
    • 
    • k nester
    • January 31, 2011