Astronomy and Cosmology

3689 topics in this forum

1. Russian Meteor Impact 2-15-13

   By Airbrush, February 21, 2013
   • 1 reply
   • 810 views
   • 
   • hypervalent_iodine
   • February 21, 2013

2. Sun azimuth at Greenwich meridian...

   By Externet, February 2, 2016
   • 1 reply
   • 810 views
   • 
   • Endy0816
   • February 2, 2016

3. What is the energy of the Universe?

   By Eren, July 25, 2017
   • 2 replies
   • 810 views
   • 
   • Mordred
   • July 26, 2017

4. If Nessie exists...

   By us.2u, April 12, 2005
   • 0 replies
   • 809 views
   • 
   • us.2u
   • April 12, 2005

5. dob vs. shmidt cassagrin

   By drizzt, May 21, 2005
   • 0 replies
   • 809 views
   • 
   • drizzt
   • May 21, 2005

6. I Took A Weird Photo during a Solar Eclipse last year

   By Aleman569, April 29, 2018
   • 2 replies
   • 809 views
   • 
   • Eise
   • May 1, 2018

7. Life

   By japan rocks/andromeda, March 27, 2010
   • 3 replies
   • 808 views
   • 
   • bobhikes
   • March 29, 2010

8. Moon Size Increased Question

   By redshift1100, February 24, 2013
   • 2 replies
   • 808 views
   • 
   • redshift1100
   • February 25, 2013

9. Lost Space

   By sethoflagos, January 24, 2021
   • 2 replies
   • 808 views
   • 
   • sethoflagos
   • January 24, 2021

10. Phoenix to Find Life on Mars??

    By Bill Nye Guy, October 29, 2005
    • 1 reply
    • 807 views
    • 
    • ecoli
    • October 29, 2005

11. Lost Planet:

    By beecee, April 17, 2018
    • 2 replies
    • 807 views
    • 
    • Airbrush
    • April 18, 2018

12. Black holes and Hawking radiation

    By Simpleton, March 26, 2010
    • 2 replies
    • 806 views
    • 
    • Simpleton
    • March 26, 2010

13. The milky way

    By japan rocks/andromeda, March 28, 2010
    • 2 replies
    • 806 views
    • 
    • Leader Bee
    • March 29, 2010

14. 3-step blackhole

    By stevebtaylor, April 16, 2010
    • 2 replies
    • 806 views
    • 
    • stevebtaylor
    • April 19, 2010

15. Earth gravity effect on the moon surface?

    By alpha2cen, February 6, 2011
    • 2 replies
    • 806 views
    • 
    • insane_alien
    • February 6, 2011

16. Regeneration

    By quantumcrack, April 9, 2005
    • 0 replies
    • 805 views
    • 
    • quantumcrack
    • April 9, 2005

17. 365 Days Of Astronomy.

    By interstellar, January 22, 2009
    • 0 replies
    • 805 views
    • 
    • interstellar
    • January 22, 2009

18. Life of the Sun

    By fwc67, September 9, 2023
    • 19 replies
    • 805 views
    • 
    • mistermack
    • September 10, 2023

19. Mars' Atmosphere?

    By coreview2, May 28, 2008
    • 1 reply
    • 804 views
    • 
    • Klaynos
    • May 28, 2008

20. Spikes on Mars

    By mistermack, July 25, 2023
    • 11 replies
    • 803 views
    • 
    • Boltzmannbrain
    • August 24, 2023

21. Why Gravity Exist??

    By Harshit Mishra, February 1, 2021
    • 3 replies
    • 802 views
    • 
    • Phi for All
    • February 1, 2021

22. There can only be one, but I made 2 versions of my Theory of Everything.

    By Kevin William Belisle, March 8, 2017
    • 1 reply
    • 801 views
    • 
    • swansont
    • March 8, 2017

23. The Fermi Paradox:

    By beecee, January 24, 2021
    • 1 reply
    • 801 views
    • 
    • mathematic
    • January 24, 2021

24. Rocket fuel

    By Kevin_Hall, January 4, 2022
    • 8 replies
    • 801 views
    • 
    • Ken Fabian
    • January 6, 2022

25. Orion below the horizon? Where am I going wrong please?

    By wotsallthis, January 6, 2022
    • 4 replies
    • 801 views
    • 
    • wotsallthis
    • January 21, 2022