Astronomy and Cosmology

3708 topics in this forum

1. Photons

   By Much Ado, March 26, 2018
   • 11 replies
   • 1.5k views
   • 
   • Area54
   • March 27, 2018

2. Multiverse

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

3. What dictates the size of a star?

   By Kurious12, April 29, 2022
   • 13 replies
   • 1.5k views
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   • swansont
   • July 12, 2022

4. Rotational Computation

   By Evlich, July 3, 2003
   • 2 replies
   • 1.5k views
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   • Evlich
   • July 3, 2003

5. Rocky planets size

   By Moontanman, January 10, 2016
   • 9 replies
   • 1.5k views
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   • Moontanman
   • January 12, 2016

6. Co-orbital Moons

   By Bettina, May 30, 2005
   • 4 replies
   • 1.5k views
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   • Spyman
   • June 1, 2005

7. Primordial Nucleosynthesis ?

   By Widdekind, October 6, 2012
   • 4 replies
   • 1.5k views
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   • Widdekind
   • October 8, 2012

8. Lunar azimuth

   By Externet, October 12, 2014
   • 1 reply
   • 1.5k views
   • 
   • studiot
   • October 12, 2014

9. T = 0

   By petrushka.googol, March 15, 2015
   • 5 replies
   • 1.5k views
   • 
   • timo
   • March 15, 2015

10. Augmented Solar Sail. Would this work?

    By mistermack, October 31, 2021
    • 12 replies
    • 1.5k views
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    • mistermack
    • November 8, 2021

11. Big unknown bodies inside orbit of Pluto

    By Fellow, January 9, 2004
    • 3 replies
    • 1.5k views
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    • Noshi
    • February 9, 2005

12. Fecund universes

    By bascule, January 20, 2006
    • 2 replies
    • 1.5k views
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    • archer
    • February 25, 2006

13. I'm off to Space School

    By Forensicmad, August 5, 2006
    • 4 replies
    • 1.5k views
    • 
    • Martin
    • August 9, 2006

14. year 2012 stops on this online converter.. WHY?

    By I think out of the box, December 28, 2011
    • 10 replies
    • 1.5k views
    • 
    • iNow
    • December 29, 2011

15. 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

16. Does the expansion of a quantum system of particles cause the creation of new space? 1 2

    By geordief, December 25, 2022
    • 28 replies
    • 1.5k views
    • 
    • Mordred
    • February 2, 2023

17. 200,000 elliptical galaxies aligned the same way

    By bascule, August 31, 2007
    • 3 replies
    • 1.5k views
    • 
    • Martin
    • August 31, 2007

18. How far away are we?

    By WinstonSmith, May 20, 2008
    • 7 replies
    • 1.5k views
    • 
    • SkepticLance
    • May 20, 2008

19. Earth's Rotational Axis as Related to the Sun

    By SwampeastMike, April 28, 2009
    • 7 replies
    • 1.5k views
    • 
    • J.C.MacSwell
    • April 30, 2009

20. Terraforming Titan

    By Hans de Vries, February 21, 2015
    • 3 replies
    • 1.5k views
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    • Afraid of Time
    • February 23, 2015

21. Do black holes have a centre?

    By geordief, December 2, 2021
    • 22 replies
    • 1.5k views
    • 
    • MigL
    • December 8, 2021

22. see through matter and space

    By Ivan Tuzikov, April 4, 2011
    • 10 replies
    • 1.5k views
    • 
    • Ivan Tuzikov
    • April 14, 2011

23. Momentum of a single photon

    By PaulS1950, April 20, 2010
    • 8 replies
    • 1.5k views
    • 
    • swansont
    • April 21, 2010

24. Dark matter research (Edinburgh conf. this week)

    By Martin, September 5, 2004
    • 8 replies
    • 1.5k views
    • 
    • Severian
    • September 15, 2004

25. Mysterious Oddities

    By us.2u, December 7, 2004
    • 5 replies
    • 1.5k views
    • 
    • us.2u
    • December 12, 2004