Astronomy and Cosmology

3708 topics in this forum

1. Could the Nemesis and/or Planet X hypotheses be correct?

   By Hypercube, June 5, 2008
   • 15 replies
   • 1.8k views
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   • Kiddy
   • June 16, 2008

2. black holes or black solid?

   By oresti, June 18, 2010
   • 7 replies
   • 1.8k views
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   • Cropduster23
   • July 7, 2010

3. What if question about the universe?

   By stevenJKpower, February 14, 2012
   • 6 replies
   • 1.8k views
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   • space noob
   • May 7, 2012

4. 2012 DA14

   By imatfaal, February 15, 2013
   • 5 replies
   • 1.8k views
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   • imatfaal
   • February 19, 2013

5. Multiverse and dark energy (split from BICEP2 discussion)

   By NeoClassic, March 19, 2014
   • 7 replies
   • 1.8k views
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   • Schneibster
   • April 10, 2014

6. Dark matter in higher dimensional space.

   By Sorcerer, October 17, 2015
   • 11 replies
   • 1.8k views
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   • Bill Angel
   • October 19, 2015

7. Mars gravity issue

   By Kevin_Hall, January 10, 2022
   • 15 replies
   • 1.8k views
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   • DaviBrons
   • January 24, 2022

8. Age of the Universe

   By Jdaniel343, January 17, 2014
   • 10 replies
   • 1.8k views
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   • Jdaniel343
   • January 18, 2014

9. Shrinking matter.

   By igosaur, April 16, 2008
   • 11 replies
   • 1.8k views
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   • Klaynos
   • April 18, 2008

10. Evaporating Black Holes

    By Dark matter, May 5, 2008
    • 7 replies
    • 1.8k views
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    • Klaynos
    • May 18, 2008

11. What direction is the big bang? (split from telescope looking at a distant star)

    By nullus, November 23, 2014
    • 12 replies
    • 1.8k views
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    • swansont
    • November 27, 2014

12. Space before spacetime or not?

    By bogie, June 21, 2006
    • 4 replies
    • 1.8k views
    • 
    • bogie
    • January 25, 2017

13. quick question on black holes

    By Cmac22, April 22, 2008
    • 11 replies
    • 1.8k views
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    • Dark matter
    • May 31, 2008

14. Will this ever reach us? (question about expansion)

    By ccwebb, May 7, 2014
    • 9 replies
    • 1.8k views
    • 
    • Mordred
    • May 9, 2014

15. Is gravity really "negative energy"?

    By QuantumT, September 25, 2019
    • 11 replies
    • 1.8k views
    • 
    • swansont
    • September 26, 2019

16. got a few questions about the big bang...

    By Guest candijo6, March 7, 2004
    • 14 replies
    • 1.8k views
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    • psi20
    • March 7, 2004

17. A new view for the universe

    By nwaogu, January 29, 2006
    • 7 replies
    • 1.8k views
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    • Klaynos
    • February 22, 2006

18. How Fast Can Dangerous Near Earth Objects Be Detected?

    By jimmydasaint, July 11, 2008
    • 14 replies
    • 1.8k views
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    • swansont
    • July 13, 2008

19. are we trying to look out of a black hole when trying to look at the past of the big bang ?

    By raphaelh42, July 14, 2022
    • 13 replies
    • 1.8k views
    • 
    • joigus
    • August 25, 2022

20. Galaxy lights distance from Earth

    By Superfastman88, March 25, 2017
    • 6 replies
    • 1.8k views
    • 
    • imatfaal
    • April 19, 2017

21. Small Comets, Dr Louis Frank, & Water in Space

    By John L, January 21, 2006
    • 8 replies
    • 1.8k views
    • 
    • John L
    • January 23, 2006

22. To save fuel fly eastwards

    By acsinuk, May 14, 2015
    • 11 replies
    • 1.8k views
    • 
    • CaptainPanic
    • May 18, 2015

23. Why plane orbits

    By P_Rog, February 8, 2005
    • 10 replies
    • 1.8k views
    • 
    • Martin
    • February 10, 2005

24. Deceleration of particles with rest mass

    By Coneys, June 19, 2010
    • 8 replies
    • 1.8k views
    • 
    • Johanluus
    • June 23, 2010

25. Lunar Tunnels and Moon Colonies:

    By beecee, May 11, 2019
    • 19 replies
    • 1.8k views
    • 
    • Endy0816
    • May 21, 2019