Astronomy and Cosmology

3708 topics in this forum

1. Gravity Waves

   By Ivanov2000, October 7, 2016
   • 8 replies
   • 1.6k views
   • 
   • Mordred
   • October 9, 2016

2. Semi-major Axis and Dark Matter

   By gmacrider, October 31, 2005
   • 8 replies
   • 1.6k views
   • 
   • gmacrider
   • November 8, 2005

3. Hubble flow interpretation

   By Jacques, September 19, 2007
   • 5 replies
   • 1.6k views
   • 
   • Spyman
   • September 21, 2007

4. Is There an Eternity?

   By General_Bloodgeon, April 23, 2018
   • 11 replies
   • 1.6k views
   • 
   • General_Bloodgeon
   • April 25, 2018

5. Lightspeed Barrier And Black Holes

   By Photon Guy, July 9, 2020
   • 9 replies
   • 1.6k views
   • 
   • swansont
   • August 20, 2020

6. Noob Question - How do people measure dis?tance of stars and galaxies far away

   By Sashatheman, April 8, 2006
   • 6 replies
   • 1.6k views
   • 
   • [Tycho?]
   • April 8, 2006

7. Tidal Friction As A Source Of Heat

   By Elen Sila, September 8, 2011
   • 0 replies
   • 1.6k views
   • 
   • Elen Sila
   • September 8, 2011

8. dark energy

   By Spin, November 21, 2005
   • 8 replies
   • 1.6k views
   • 
   • luc
   • December 13, 2005

9. cause of gravitational lensing

   By spunnery, March 12, 2007
   • 13 replies
   • 1.6k views
   • 
   • merlin wood
   • March 25, 2007

10. Astrospheres: the missing catalog and a proposal to make one

    By Jayson, October 30, 2016
    • 10 replies
    • 1.6k views
    • 
    • Jayson
    • October 30, 2016

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

    By stephaneww, April 17, 2019
    • 11 replies
    • 1.6k views
    • 
    • stephaneww
    • August 18, 2019

12. The Great Internet Black Hole Survey

    By ed84c, September 1, 2004
    • 5 replies
    • 1.6k views
    • 
    • Thales
    • September 13, 2004

13. Can there be a black hole large enough to pull objects faster than light

    By Lekgolo555, March 9, 2007
    • 9 replies
    • 1.6k views
    • 
    • timo
    • March 13, 2007

14. Space, the bad news (and some limited good news)

    By Martin, May 31, 2008
    • 6 replies
    • 1.6k views
    • 
    • Martin
    • June 5, 2008

15. Approximation attempt, thoughts?

    By Endy0816, June 8, 2016
    • 11 replies
    • 1.6k views
    • 
    • Mordred
    • June 11, 2016

16. Is Space vacuum (empty)

    By mab, September 29, 2004
    • 6 replies
    • 1.6k views
    • 
    • ed84c
    • October 2, 2004

17. video of meteor hitting moon

    By Martin, June 14, 2006
    • 11 replies
    • 1.6k views
    • 
    • Martin
    • June 18, 2006

18. COMET Ison coming into view - reported Nov 23 Horizon BBC2

    By Mike Smith Cosmos, November 23, 2013
    • 5 replies
    • 1.6k views
    • 
    • Mike Smith Cosmos
    • November 24, 2013

19. New telescope array captures planet-forming disk

    By sunshaker, November 12, 2014
    • 6 replies
    • 1.6k views
    • 
    • Robittybob1
    • November 12, 2014

20. Astronomy Homework Questions! Help!

    By Joshua Simons, February 10, 2015
    • 1 reply
    • 1.6k views
    • 
    • AidanThomas
    • February 10, 2015

21. Dark Matter

    By degree451, October 10, 2011
    • 7 replies
    • 1.6k views
    • 
    • Bart
    • October 20, 2011

22. Steelworks of Saturn

    By Gian, August 12, 2021
    • 13 replies
    • 1.6k views
    • 
    • Airbrush
    • August 16, 2021

23. Energy dependence in speed of light may have been observed

    By Martin, August 23, 2007
    • 5 replies
    • 1.6k views
    • 
    • BhavinB
    • August 27, 2007

24. how is universe expanding after the big bang.

    By sunofawrx, August 24, 2005
    • 6 replies
    • 1.6k views
    • 
    • Bubba
    • August 27, 2005

25. Universe is 156 billion LY across

    By Realitycheck, March 2, 2008
    • 12 replies
    • 1.6k views
    • 
    • jackson33
    • March 13, 2008