Astronomy and Cosmology

3705 topics in this forum

1. Help me please, need information on galaxies

   By SergUpstart, October 12, 2019
   • 3 replies
   • 1.3k views
   • 
   • SergUpstart
   • October 12, 2019

2. Star's habitable zone?

   By Moontanman, June 8, 2019
   • 9 replies
   • 1.4k views
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   • Moontanman
   • September 30, 2019

3. Is gravity really "negative energy"?

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

4. Is space infinite or finite?

   By Gater, September 10, 2019
   • 1 reply
   • 1.1k views
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   • Strange
   • September 10, 2019

5. Who said the Universe had a beginning? 1 2 3 4

   By Gater, August 11, 2019
   • 97 replies
   • 50.3k views
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   • swansont
   • September 5, 2019

6. Chances of a comet hitting us ?

   By boo, September 2, 2019
   • 8 replies
   • 1.6k views
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   • Janus
   • September 3, 2019

7. DIY: Wormhole!

   By QuantumT, August 31, 2019
   • 0 replies
   • 816 views
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   • QuantumT
   • August 31, 2019

8. If you could tour the galaxy what spectacles would you go to see?

   By boo, August 29, 2019
   • 9 replies
   • 1.3k views
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   • swansont
   • August 29, 2019

9. Dark matter = Gravity?

   By QuantumT, August 6, 2019
   • 7 replies
   • 1.5k views
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   • QuantumT
   • August 27, 2019

10. The theory of infinity.

    By Guest123456, August 15, 2019
    • 20 replies
    • 2k views
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    • Mordred
    • August 22, 2019

11. Is the dark energy already present as vacuum energy by nature in the equations of general relativity ?

    By stephaneww, April 17, 2019
    • 11 replies
    • 1.6k views
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    • stephaneww
    • August 18, 2019

12. Why is the Earth electrically neutral?

    By Bluemoon, November 20, 2014
    • 11 replies
    • 8.4k views
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    • John Cuthber
    • August 12, 2019

13. Furthest "cloaked BH" found:

    By beecee, August 8, 2019
    • 0 replies
    • 716 views
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    • beecee
    • August 8, 2019

14. The Habitable Exoplanet Hunting Project

    By alfa015, July 13, 2019
    • 1 reply
    • 834 views
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    • alfa015
    • August 6, 2019

15. Space dimensions

    By Tesseract999, August 2, 2019
    • 16 replies
    • 1.7k views
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    • Strange
    • August 3, 2019

16. Achieving Mars-Earth comunication High-Bandwidth

    By MaximT, July 28, 2019
    • 16 replies
    • 1.8k views
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    • swansont
    • July 29, 2019

17. A New Area Law in General Relativity, questions.

    By beecee, July 26, 2019
    • 7 replies
    • 975 views
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    • Mordred
    • July 27, 2019

18. Can gravitational waves be affected by matter?

    By Ghideon, May 21, 2019
    • 23 replies
    • 2.2k views
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    • swansont
    • July 25, 2019

19. A basic question about the big bang

    By Courage, July 17, 2019
    • 7 replies
    • 1.2k views
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    • Mordred
    • July 25, 2019

20. Asteroid

    By Leewright10, July 24, 2019
    • 4 replies
    • 1k views
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    • Mordred
    • July 25, 2019

21. All observed blue-shifted galaxies are in our Hubble horizon.

    By StringJunky, July 23, 2019
    • 2 replies
    • 662 views
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    • StringJunky
    • July 23, 2019

22. Mars colony of 500,000 people may not be possible 1 2

    By nec209, June 15, 2019
    • 44 replies
    • 5.5k views
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    • Moontanman
    • July 18, 2019

23. Asteroids As Gas Stations

    By Airbrush, July 11, 2019
    • 19 replies
    • 2.1k views
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    • Curious layman
    • July 16, 2019

24. Effects of Rotation Around the Axis

    By Weitter Duckss, July 16, 2019
    • 8 replies
    • 938 views
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    • swansont
    • July 16, 2019

25. heat transfer in stars

    By Lizzzza, July 14, 2019
    • 0 replies
    • 651 views
    • 
    • Lizzzza
    • July 14, 2019