Astronomy and Cosmology

3713 topics in this forum

1. Telescope Mirror- thickness

   By Wil242424, February 10, 2017
   • 5 replies
   • 1.7k views
   • 
   • Bender
   • February 14, 2017

2. Laser-Driven Tidal Wave to Understand What Happens to Information Inside a Blackhole. Opinions? Thoughts?

   By Wil242424, February 6, 2017
   • 3 replies
   • 1.2k views
   • 
   • MigL
   • February 13, 2017

3. Boundary condition at the Big Bang

   By Bill S, February 8, 2017
   • 2 replies
   • 1.2k views
   • 
   • Bill S
   • February 8, 2017

4. List of galaxies by size?

   By Daecon, February 5, 2017
   • 3 replies
   • 1.3k views
   • 
   • Outrider
   • February 6, 2017

5. History of Astronomy?

   By Cosmo_Ken, January 11, 2017
   • 6 replies
   • 1.5k views
   • 
   • swansont
   • February 5, 2017

6. Dipole Repeller. Wait,what?

   By Outrider, January 30, 2017
   • 21 replies
   • 4.8k views
   • 
   • Mordred
   • February 3, 2017

7. Are all comprised of waves?

   By Quantum321, January 6, 2017
   • 21 replies
   • 2.7k views
   • 
   • swansont
   • February 1, 2017

8. Exoplanet moons. Are they being detected?

   By Outrider, January 28, 2017
   • 2 replies
   • 974 views
   • 
   • Outrider
   • January 28, 2017

9. Horava Gravity

   By Bill S, January 14, 2017
   • 8 replies
   • 1.7k views
   • 
   • Bill S
   • January 26, 2017

10. Space before spacetime or not?

    By bogie, June 21, 2006
    • 4 replies
    • 1.9k views
    • 
    • bogie
    • January 25, 2017

11. Using Kepler's laws to find out various things about binary star systems

    By QuantumPerihelion, January 24, 2017
    • 5 replies
    • 1.3k views
    • 
    • Janus
    • January 25, 2017

12. Was the start of the Big Bang really the beginning of time?

    By Cosmo_Ken, January 9, 2017
    • 14 replies
    • 1.9k views
    • 
    • Strange
    • January 24, 2017

13. Could black holes create entire new universes?

    By Wil242424, January 17, 2017
    • 6 replies
    • 1.4k views
    • 
    • Mordred
    • January 22, 2017

14. DIY Telescope that can see the universe

    By fluid, January 18, 2017
    • 4 replies
    • 1.2k views
    • 
    • J.C.MacSwell
    • January 19, 2017

15. Universal expansion, coordinate systems, time and the block universe

    By studiot, January 12, 2017
    • 3 replies
    • 1k views
    • 
    • Mordred
    • January 12, 2017

16. One detail about the Big Bang that I am still not to clear on...

    By Excalibur0047, January 7, 2017
    • 14 replies
    • 1.8k views
    • 
    • StringJunky
    • January 9, 2017

17. Where are we 1 2 3 4

    By 36grit, December 1, 2016
    • 75 replies
    • 9.2k views
    • 
    • Berj / KI3U
    • January 5, 2017

18. Expansion (split from quantification of space-time)

    By pittsburghjoe, December 25, 2016
    • 1 reply
    • 1k views
    • 
    • Strange
    • December 25, 2016

19. New Unifying Theory

    By ronnie33, December 16, 2016
    • 6 replies
    • 1.8k views
    • 
    • Strange
    • December 16, 2016

20. A Revised Unifying Theory. Is it any good?

    By Conway2, December 10, 2016
    • 6 replies
    • 1.3k views
    • 
    • Strange
    • December 10, 2016

21. Astronomers unveil most detailed map of the Milky Way to date

    By Sensei, December 7, 2016
    • 7 replies
    • 1.4k views
    • 
    • Janus
    • December 9, 2016

22. Hubble_constant_debate

    By es111, December 7, 2016
    • 18 replies
    • 1.9k views
    • 
    • Mordred
    • December 9, 2016

23. Gravitational_lensing_sky_observations

    By es111, December 8, 2016
    • 2 replies
    • 906 views
    • 
    • AbstractDreamer
    • December 8, 2016

24. A Unifying Theory

    By rstormview, December 6, 2016
    • 1 reply
    • 1.2k views
    • 
    • swansont
    • December 6, 2016

25. Could dark matter form planet sized objects?

    By imatfaal, December 4, 2016
    • 9 replies
    • 1.4k views
    • 
    • Janus
    • December 5, 2016