Astronomy and Cosmology

3430 topics in this forum

1. Chances of a comet hitting us ?

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

2. DIY: Wormhole!

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

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

   By boo, August 29, 2019
   • 9 replies
   • 494 views
   • 
   • swansont
   • August 29, 2019

4. Dark matter = Gravity?

   By QuantumT, August 6, 2019
   • 7 replies
   • 640 views
   • 
   • QuantumT
   • August 27, 2019

5. The theory of infinity.

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

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

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

7. Why is the Earth electrically neutral?

   By Bluemoon, November 20, 2014
   • 11 replies
   • 6039 views
   • 
   • John Cuthber
   • August 12, 2019

8. Furthest "cloaked BH" found:

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

9. The Habitable Exoplanet Hunting Project

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

10. Space dimensions

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

11. Achieving Mars-Earth comunication High-Bandwidth

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

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

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

13. Can gravitational waves be affected by matter?

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

14. A basic question about the big bang

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

15. Asteroid

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

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

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

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

    By nec209, June 15, 2019
    • 44 replies
    • 1633 views
    • 
    • Moontanman
    • July 18, 2019

18. Asteroids As Gas Stations

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

19. Effects of Rotation Around the Axis

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

20. heat transfer in stars

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

21. Dark Energy

    By geordief, July 13, 2019
    • 1 reply
    • 304 views
    • 
    • Strange
    • July 13, 2019

22. Space Radiation: Astronauts: Cancer:

    By beecee, July 11, 2019
    • 3 replies
    • 349 views
    • 
    • Curious layman
    • July 12, 2019

23. First real Black Hole image - 10 April 2019 1 2 3 4 5

    By Elendirs, April 8, 2019
    • 121 replies
    • 3814 views
    • 
    • Strange
    • July 12, 2019

24. Viewing distant galaxies in unprecedented detail

    By beecee, July 10, 2019
    • 1 reply
    • 341 views
    • 
    • Mordred
    • July 11, 2019

25. The speed change of Oumuamua

    By peglerbc, December 29, 2018
    • 7 replies
    • 596 views
    • 
    • swansont
    • July 10, 2019