Astronomy and Cosmology

3708 topics in this forum

1. Heavy radioactive elements in a star

   By Moontanman, April 7, 2017
   • 3 replies
   • 1.6k views
   • 
   • Moontanman
   • July 23, 2017

2. Aren't planets have orbit because of centrifugal force?

   By Eren, July 19, 2017
   • 7 replies
   • 1.4k views
   • 
   • swansont
   • July 19, 2017

3. Einstein or me?

   By Tub, July 18, 2017
   • 7 replies
   • 1.3k views
   • 
   • StringJunky
   • July 19, 2017

4. The origin of life on planet Earth

   By belisariusbilberry, July 18, 2017
   • 5 replies
   • 1.2k views
   • 
   • Area54
   • July 19, 2017

5. Gravity and all that:

   By beecee, July 15, 2017
   • 3 replies
   • 1.3k views
   • 
   • Mordred
   • July 16, 2017

6. The Violence of the Early Universe:

   By beecee, July 1, 2017
   • 9 replies
   • 1.7k views
   • 
   • Silvestru
   • July 7, 2017

7. Protecting Astro/Cosmonauts

   By beecee, July 3, 2017
   • 0 replies
   • 1k views
   • 
   • beecee
   • July 3, 2017

8. Tiangong-1 uncontrolled reentry

   By Cristiano, June 27, 2017
   • 10 replies
   • 3.3k views
   • 
   • mistermack
   • June 30, 2017

9. How far. 1 2

   By Bird11dog, February 12, 2017
   • 42 replies
   • 6.4k views
   • 
   • beecee
   • June 28, 2017

10. Gravity Fueling the Expansion of the Universe

    By AbnormallyHonest, June 28, 2017
    • 21 replies
    • 2.4k views
    • 
    • AbnormallyHonest
    • June 28, 2017

11. Binary Solar System 1 2

    By AbnormallyHonest, May 22, 2017
    • 30 replies
    • 3.5k views
    • 
    • AbnormallyHonest
    • June 28, 2017

12. Does the weight of an object change in the slightest relative to the position of the Moon, Sun, Other objects?

    By Silvestru, June 26, 2017
    • 13 replies
    • 1.5k views
    • 
    • swansont
    • June 27, 2017

13. Star cluster breakup

    By Moontanman, June 17, 2017
    • 4 replies
    • 1.2k views
    • 
    • stefan r
    • June 27, 2017

14. Two large Macro Black Holes entangled?

    By Jmanm, June 14, 2017
    • 9 replies
    • 1.4k views
    • 
    • stefan r
    • June 26, 2017

15. No Universe without the BB:

    By beecee, June 15, 2017
    • 5 replies
    • 1.8k views
    • 
    • petrushka.googol
    • June 22, 2017

16. Is the CMB a Reflection of the Universe Before the Big Bang?

    By kevmac, June 13, 2017
    • 4 replies
    • 1.2k views
    • 
    • petrushka.googol
    • June 22, 2017

17. Magnetic field of neutron stars

    By King108, June 16, 2017
    • 1 reply
    • 1k views
    • 
    • beecee
    • June 16, 2017

18. The State of a Black hole

    By King108, June 14, 2017
    • 6 replies
    • 1.3k views
    • 
    • beecee
    • June 16, 2017

19. Is interstellar travel possible? 1 2 3

    By Dinokilla45, September 23, 2013
    • 64 replies
    • 10.5k views
    • 
    • Phi for All
    • June 10, 2017

20. Gravitational/Scalar Waves 1 2

    By Ant Sinclair, April 10, 2017
    • 34 replies
    • 4.7k views
    • 
    • beecee
    • June 10, 2017

21. Effect of collisions while travelling at relativistic speeds? 1 2

    By Fanghur, April 6, 2017
    • 26 replies
    • 3.7k views
    • 
    • KipIngram
    • May 25, 2017

22. Energy in space?

    By jadejadejade, May 25, 2017
    • 2 replies
    • 1.1k views
    • 
    • swansont
    • May 25, 2017

23. Terraforming Mars 1 2

    By Martin or Nota, April 13, 2017
    • 32 replies
    • 4.2k views
    • 
    • mistermack
    • May 19, 2017

24. How far are you alive near a binary neutron star system?

    By Arthur d. S. Jr., May 16, 2017
    • 4 replies
    • 1.3k views
    • 
    • Raider5678
    • May 16, 2017

25. S2 orbit deviates from Keplerian ellipse 1 2 3 4

    By David Levy, April 1, 2017
    • 79 replies
    • 8.9k views
    • 
    • Janus
    • May 10, 2017