Astronomy and Cosmology

3708 topics in this forum

1. Is Earth's atmosphere transparent one way only?

   By Moreno, May 17, 2019
   • 7 replies
   • 1.1k views
   • 
   • pzkpfw
   • May 18, 2019

2. Planetary Migration:

   By beecee, May 10, 2019
   • 10 replies
   • 1.1k views
   • 
   • Moontanman
   • May 12, 2019

3. Infinite gravity 1 2

   By awaterpon, May 2, 2019
   • 34 replies
   • 3.4k views
   • 
   • Strange
   • May 9, 2019

4. Science terms and science questions

   By Wolte, May 1, 2019
   • 14 replies
   • 1.3k views
   • 
   • Strange
   • May 2, 2019

5. Black Hole: Why do we believe that matter could be such dense? 1 2 3 4

   By MaximT, April 13, 2019
   • 93 replies
   • 9.3k views
   • 
   • Strange
   • April 23, 2019

6. Questions about black holes and the Hawking radiation. 1 2 3

   By lucks_021, April 14, 2019
   • 57 replies
   • 5.9k views
   • 
   • beecee
   • April 19, 2019

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

   By michel123456, April 17, 2019
   • 8 replies
   • 829 views
   • 
   • Strange
   • April 19, 2019

8. Proving the wormhole

   By QuantumT, April 18, 2019
   • 1 reply
   • 594 views
   • 
   • beecee
   • April 19, 2019

9. Is there Electric Propulsion?

   By DARK0717, April 7, 2019
   • 17 replies
   • 1.6k views
   • 
   • DARK0717
   • April 16, 2019

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

    By beecee, April 16, 2019
    • 0 replies
    • 590 views
    • 
    • beecee
    • April 16, 2019

11. Cosmic filaments and universe expansion

    By Ghideon, April 13, 2019
    • 4 replies
    • 1.1k views
    • 
    • Ghideon
    • April 14, 2019

12. a stupid question

    By Dumb cowboy, April 12, 2019
    • 9 replies
    • 1.5k views
    • 
    • pzkpfw
    • April 12, 2019

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

    By Bill Angel, April 11, 2019
    • 2 replies
    • 908 views
    • 
    • beecee
    • April 11, 2019

14. Black Hole Energy Distribution 1 2

    By QuantumT, January 7, 2019
    • 37 replies
    • 3.4k views
    • 
    • Strange
    • April 10, 2019

15. Question about Inflation Theory.

    By iloveknowledge, April 7, 2019
    • 8 replies
    • 1.3k views
    • 
    • StringJunky
    • April 8, 2019

16. The outer limits of spacetime

    By QuantumT, March 21, 2019
    • 14 replies
    • 1.4k views
    • 
    • Strange
    • April 8, 2019

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

    By Intrigued, April 3, 2019
    • 0 replies
    • 682 views
    • 
    • Intrigued
    • April 3, 2019

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

    By stephaneww, March 25, 2019
    • 3 replies
    • 877 views
    • 
    • stephaneww
    • March 29, 2019

19. Mini Tremors detected on Mars for first time:

    By beecee, March 19, 2019
    • 3 replies
    • 818 views
    • 
    • beecee
    • March 21, 2019

20. Planets made of gases

    By C D Mohatta, February 22, 2019
    • 5 replies
    • 945 views
    • 
    • Intrigued
    • March 21, 2019

21. What happened before the big bang?

    By Vexen, March 16, 2019
    • 7 replies
    • 1.1k views
    • 
    • Phi for All
    • March 16, 2019

22. What's the half life of dark matter?

    By Vexen, March 16, 2019
    • 5 replies
    • 1k views
    • 
    • Strange
    • March 16, 2019

23. A moon coverall to simulate Earth gravity on the Moon

    By harlock, March 8, 2019
    • 8 replies
    • 1.1k views
    • 
    • Carrock
    • March 13, 2019

24. Does it take an infinite time to reach the center of a black hole?

    By Vexen, March 4, 2019
    • 6 replies
    • 820 views
    • 
    • beecee
    • March 5, 2019

25. Is there an edge of space or is it infinite?

    By Vexen, March 4, 2019
    • 2 replies
    • 800 views
    • 
    • beecee
    • March 4, 2019