Astronomy and Cosmology

3710 topics in this forum

1. Habitable zone of a star

   By AXdlv, December 22, 2018
   • 22 replies
   • 2.2k views
   • 
   • peglerbc
   • December 29, 2018

2. Why we mark a New Year January 1?

   By Moreno, December 26, 2018
   • 10 replies
   • 1.4k views
   • 
   • dimreepr
   • December 27, 2018

3. Questions around the LambdaCDM model and a classical mechanics model of universe

   By stephaneww, December 8, 2018
   • 5 replies
   • 927 views
   • 
   • stephaneww
   • December 26, 2018

4. Quasi-Steady State Model and the Expanding Universe

   By Heisenberg1927, December 23, 2018
   • 10 replies
   • 1.6k views
   • 
   • Carrock
   • December 23, 2018

5. Identification of celestial objects and observable universe

   By Heisenberg1927, December 22, 2018
   • 5 replies
   • 1.3k views
   • 
   • Heisenberg1927
   • December 23, 2018

6. Two Theoretical Bodies in Space, Time to Collide.

   By Zemy, December 13, 2018
   • 3 replies
   • 749 views
   • 
   • Janus
   • December 14, 2018

7. Multiverse

   By Siyatanush, December 11, 2018
   • 14 replies
   • 1.5k views
   • 
   • Airbrush
   • December 13, 2018

8. Help Needed Over Stellar Magnitude Issue

   By GeeKay, December 10, 2018
   • 2 replies
   • 1.1k views
   • 
   • GeeKay
   • December 11, 2018

9. Largest yet Binary BH Collision Discovered:

   By beecee, December 3, 2018
   • 2 replies
   • 820 views
   • 
   • Strange
   • December 8, 2018

10. Cosmological redshift 1 2

    By Itoero, October 25, 2018
    • 30 replies
    • 3.5k views
    • 
    • Eise
    • December 7, 2018

11. Earth/solar system attitude WRT galaxy

    By MigL, December 4, 2018
    • 5 replies
    • 956 views
    • 
    • Strange
    • December 4, 2018

12. No energy conservation in photon by E=hf (f↓) in space of expansion 1 2

    By Jinsuk Kim, November 22, 2018
    • 41 replies
    • 3.7k views
    • 
    • Strange
    • November 30, 2018

13. Simple question about the multiverse

    By mondeluz, November 19, 2018
    • 3 replies
    • 910 views
    • 
    • Sensei
    • November 27, 2018

14. Black hole spin

    By Moontanman, November 20, 2018
    • 8 replies
    • 827 views
    • 
    • beecee
    • November 20, 2018

15. Black Holes (split from: So, you've got a new theory...) 1 2

    By beecee, November 19, 2018
    • 32 replies
    • 2.5k views
    • 
    • hypervalent_iodine
    • November 20, 2018

16. Measuring the Universe with Gravitational waves and GR:

    By beecee, November 18, 2018
    • 0 replies
    • 608 views
    • 
    • beecee
    • November 18, 2018

17. On the Existence of Black Holes:

    By beecee, November 15, 2018
    • 1 reply
    • 745 views
    • 
    • beecee
    • November 16, 2018

18. Expansion of the Universe

    By Mordeth, November 2, 2018
    • 2 replies
    • 913 views
    • 
    • Conjurer
    • November 7, 2018

19. I have a theory

    By Gluk, October 27, 2018
    • 2 replies
    • 1.1k views
    • 
    • mistermack
    • October 27, 2018

20. Stars that can become trillions of years?

    By Hello2, August 23, 2018
    • 5 replies
    • 1.3k views
    • 
    • Airbrush
    • October 25, 2018

21. This speculative SpaceX timeline reveals roughly when, where, and how Elon Musk plans to colonise Mars 1 2 3

    By beecee, October 15, 2018
    • 53 replies
    • 5.7k views
    • 
    • beecee
    • October 24, 2018

22. Black holes (split from Is it possible to change the spin of a proton?)

    By lucks_021, October 22, 2018
    • 3 replies
    • 934 views
    • 
    • Strange
    • October 22, 2018

23. Holograms 1 2 3

    By PrimalMinister, September 24, 2018
    • 53 replies
    • 4.7k views
    • 
    • Strange
    • October 22, 2018

24. Doubling the Detection of FRB's :

    By beecee, October 11, 2018
    • 13 replies
    • 1.2k views
    • 
    • mistermack
    • October 17, 2018

25. Going to Venus before Mars?

    By beecee, October 16, 2018
    • 2 replies
    • 863 views
    • 
    • Airbrush
    • October 17, 2018