Astronomy and Cosmology

3708 topics in this forum

1. Sun Travel

   By SKF, December 11, 2009
   • 23 replies
   • 3.1k views
   • 
   • iNow
   • December 20, 2009

2. Mars: Life?

   By Poena, April 25, 2003
   • 16 replies
   • 3.1k views
   • 
   • Radical Edward
   • June 23, 2003

3. Multiple images of same galaxies?

   By Jiggerj, February 5, 2012
   • 20 replies
   • 3.1k views
   • 
   • zapatos
   • February 29, 2012

4. Some exomoons could be habitable for humans

   By alfa015, June 20, 2020
   • 22 replies
   • 3.1k views
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   • Endy0816
   • August 12, 2020

5. Tesseract

   By Yash, May 5, 2013
   • 2 replies
   • 3.1k views
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   • mathematic
   • May 5, 2013

6. Possible explanation of dark matter

   By 36grit, October 28, 2011
   • 16 replies
   • 3.1k views
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   • G Anthony
   • December 14, 2011

7. Two comet system

   By petrushka.googol, October 29, 2013
   • 4 replies
   • 3.1k views
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   • BusaDave9
   • October 30, 2013

8. Should we reply to the WOW! Signal?

   By alfa015222, November 14, 2020
   • 20 replies
   • 3.1k views
   • 
   • joigus
   • January 2, 2021

9. WMAP Results

   By fafalone, February 12, 2003
   • 13 replies
   • 3.1k views
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   • alt_f13
   • September 18, 2003

10. is the sun losing mass?

    By spikerz66, February 19, 2007
    • 18 replies
    • 3.1k views
    • 
    • D H
    • February 22, 2007

11. The Big Bang Theory, Expansion/Inflation plus "Explosion" 1 2

    By geordief, September 9, 2017
    • 28 replies
    • 3.1k views
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    • Area54
    • September 13, 2017

12. Why do we think there is dark matter and dark energy?

    By Anthony Morris, October 12, 2017
    • 24 replies
    • 3.1k views
    • 
    • Strange
    • November 2, 2017

13. Which galaxies will become gravitationally bound to us after our collision with Andromeda? 1 2

    By MarkE, November 11, 2017
    • 34 replies
    • 3.1k views
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    • Mordred
    • November 25, 2017

14. How Does Mercury Really Look Like?

    By Orcus, October 2, 2017
    • 3 replies
    • 3.1k views
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    • Chopsticks
    • October 3, 2017

15. Search for signs of Intelligent ET's in the Solar System 1 2

    By Ivan Tuzikov, February 17, 2016
    • 29 replies
    • 3.1k views
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    • Airbrush
    • February 25, 2016

16. time and space 1 2

    By jamey2k9, March 1, 2009
    • 28 replies
    • 3.1k views
    • 
    • gre
    • March 7, 2009

17. Why is the sunrise less red than sunset?

    By Jdizz, October 25, 2012
    • 2 replies
    • 3.1k views
    • 
    • STeve555
    • October 25, 2012

18. Cyclic Universe

    By Bettina, August 16, 2006
    • 22 replies
    • 3.1k views
    • 
    • bascule
    • August 21, 2006

19. sound of the sun

    By flass, June 9, 2004
    • 20 replies
    • 3.1k views
    • 
    • Cap'n Refsmmat
    • July 20, 2004

20. Living away from earth (split from Mars gravity issue) 1 2

    By mistermack, January 12, 2022
    • 28 replies
    • 3.1k views
    • 
    • mistermack
    • August 7, 2022

21. Getting darker early in Tenerife thanin England

    By ohdearme, July 25, 2015
    • 3 replies
    • 3.1k views
    • 
    • ohdearme
    • July 27, 2015

22. moon is going away

    By chitrangda, July 17, 2006
    • 18 replies
    • 3.1k views
    • 
    • swansont
    • July 19, 2006

23. Antimatter Rocket Speed

    By Jon0815, April 11, 2011
    • 6 replies
    • 3.1k views
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    • Neotropic
    • April 13, 2011

24. Negative energy and Dark energy

    By Milligan, August 8, 2011
    • 3 replies
    • 3.1k views
    • 
    • icarus2
    • August 9, 2011

25. Kerr Binary Blackhole systems

    By artbeing B, October 8, 2012
    • 7 replies
    • 3.1k views
    • 
    • EquisDeXD
    • October 12, 2012