Astronomy and Cosmology

3708 topics in this forum

1. The search for habitable exoplanets in Alpha Centauri

   By alfa015, October 26, 2019
   • 0 replies
   • 790 views
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   • alfa015
   • October 26, 2019

2. A strange hypothetical planet

   By Moreno, September 14, 2018
   • 9 replies
   • 1.9k views
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   • Janus
   • October 14, 2019

3. Treasure From Asteroids 1 2

   By Airbrush, July 25, 2019
   • 36 replies
   • 34.9k views
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   • Moontanman
   • October 13, 2019

4. Help me please, need information on galaxies

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

5. Star's habitable zone?

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

6. Is gravity really "negative energy"?

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

7. Is space infinite or finite?

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

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

   By Gater, August 11, 2019
   • 97 replies
   • 50.6k views
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   • swansont
   • September 5, 2019

9. Chances of a comet hitting us ?

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

10. DIY: Wormhole!

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

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

    By boo, August 29, 2019
    • 9 replies
    • 1.4k views
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    • swansont
    • August 29, 2019

12. Dark matter = Gravity?

    By QuantumT, August 6, 2019
    • 7 replies
    • 1.6k views
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    • QuantumT
    • August 27, 2019

13. The theory of infinity.

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

14. 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

15. Why is the Earth electrically neutral?

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

16. Furthest "cloaked BH" found:

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

17. The Habitable Exoplanet Hunting Project

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

18. Space dimensions

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

19. Achieving Mars-Earth comunication High-Bandwidth

    By MaximT, July 28, 2019
    • 16 replies
    • 1.9k views
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    • swansont
    • July 29, 2019

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

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

21. Can gravitational waves be affected by matter?

    By Ghideon, May 21, 2019
    • 23 replies
    • 2.3k views
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    • swansont
    • July 25, 2019

22. A basic question about the big bang

    By Courage, July 17, 2019
    • 7 replies
    • 1.3k views
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    • Mordred
    • July 25, 2019

23. Asteroid

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

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

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

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

    By nec209, June 15, 2019
    • 44 replies
    • 5.7k views
    • 
    • Moontanman
    • July 18, 2019