Astronomy and Cosmology

3323 topics in this forum

1. Cosmo Basics

   By Martin, October 19, 2008
   • 13 replies
   • 20728 views
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   • swansont
   • August 3, 2018

2. Cosmological Principle

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   By Mordred, May 30, 2015
   • 49 replies
   • 23589 views
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   • YaDinghus
   • July 8, 2018

3. Using BOINC / seti@home?

   By Sayonara, August 29, 2010
   • 10 replies
   • 14636 views
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   • Altruist1
   • March 26, 2016

4. Astronomy links

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   By Martin, May 24, 2004
   • 102 replies
   • 82746 views
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   • tinalay91
   • January 6, 2016

5. Questions about black holes and the Hawking radiation.

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   By lucks_021, Sunday at 05:30 AM
   • 57 replies
   • 871 views
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   • beecee
   • 6 hours ago

6. Does an event Horizon have the 2 meanings of horizon?

   By michel123456, Wednesday at 10:29 AM
   • 8 replies
   • 107 views
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   • Strange
   • 18 hours ago

7. Black Hole: Why do we believe that matter could be such dense?

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   By MaximT, April 13
   • 77 replies
   • 1170 views
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   • michel123456
   • 19 hours ago

8. Proving the wormhole

   By QuantumT, Thursday at 11:30 PM
   • 1 reply
   • 31 views
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   • beecee
   • Yesterday at 12:12 AM

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

   By stephaneww, Wednesday at 10:12 AM
   • 0 replies
   • 62 views
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   • stephaneww
   • Wednesday at 10:12 AM

10. Is there Electric Propulsion?

    By DARK0717, April 7
    • 17 replies
    • 159 views
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    • DARK0717
    • Tuesday at 05:38 PM

11. Meteorites, Meteoroids, Meteors, Comets, and Asteroids; [and Bolides if you wish:]

    By beecee, Tuesday at 12:55 AM
    • 0 replies
    • 36 views
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    • beecee
    • Tuesday at 12:55 AM

12. Cosmic filaments and universe expansion

    By Ghideon, April 13
    • 4 replies
    • 82 views
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    • Ghideon
    • Sunday at 08:14 PM

13. 3 facts maybe you don't know about antimatter

    By alfa015, April 14
    • 4 replies
    • 104 views
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    • Janus
    • Sunday at 03:35 PM

14. First real Black Hole image - 10 April 2019

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    By Elendirs, April 8
    • 120 replies
    • 1728 views
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    • Strange
    • April 13

15. a stupid question

    By Dumb cowboy, April 12
    • 9 replies
    • 196 views
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    • pzkpfw
    • April 12

16. Is there a problem reconciling the properties of a black hole with the properties of the "big bang"?

    By Bill Angel, April 11
    • 2 replies
    • 72 views
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    • beecee
    • April 11

17. Black Hole Energy Distribution

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    By QuantumT, January 7
    • 37 replies
    • 741 views
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    • Strange
    • April 10

18. Question about Inflation Theory.

    By iloveknowledge, April 7
    • 8 replies
    • 186 views
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    • StringJunky
    • April 8

19. The outer limits of spacetime

    By QuantumT, March 21
    • 14 replies
    • 209 views
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    • Strange
    • April 8

20. Why is there something rather than nothing?

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    By Vexen, March 16
    • 41 replies
    • 611 views
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    • Airbrush
    • April 6

21. The nature and origin of Charon's smooth plains

    By Intrigued, April 3
    • 0 replies
    • 73 views
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    • Intrigued
    • April 3

22. Could the acceleration of expansion have a simple geometric reason ?

    By stephaneww, March 25
    • 3 replies
    • 247 views
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    • stephaneww
    • March 29

23. Mini Tremors detected on Mars for first time:

    By beecee, March 19
    • 3 replies
    • 122 views
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    • beecee
    • March 21

24. Planets made of gases

    By C D Mohatta, February 22
    • 5 replies
    • 179 views
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    • Intrigued
    • March 21

25. What happened before the big bang?

    By Vexen, March 16
    • 7 replies
    • 147 views
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    • Phi for All
    • March 16