Astronomy and Cosmology

3708 topics in this forum

1. Cosmological Redshift and metric expansion 1 2 3 4 5

   By AbstractDreamer, May 23, 2023
   • 114 replies
   • 8.1k views
   • 
   • Mordred
   • June 9

2. small radio telescopes

   By sddfds, May 20
   • 5 replies
   • 651 views
   • 
   • Phi for All
   • May 27

3. Universe related questions

   By Bobdihi, May 24
   • 1 reply
   • 482 views
   • 
   • Phi for All
   • May 24

4. Big Bang starting reference point 1 2

   By bsolomon_us, May 16
   • 30 replies
   • 1.1k views
   • 
   • Mordred
   • May 18

5. The black hole stars

   By atom_cosmic10, May 12
   • 6 replies
   • 792 views
   • 
   • atom_cosmic10
   • May 14

6. Why I saw the moon being ~twice size as usual?

   By raphaelh42, May 4
   • 2 replies
   • 264 views
   • 
   • raphaelh42
   • May 5

7. What might things have looked like before the Higgs Field?

   By geordief, May 1
   • 1 reply
   • 386 views
   • 
   • Mordred
   • May 1

8. Space Expansion, wavelength and energy density

   By AbstractDreamer, August 28, 2023
   • 7 replies
   • 1k views
   • 
   • AbstractDreamer
   • April 26

9. Sunshine on Titan 1 2

   By Gian, March 22
   • 27 replies
   • 1.8k views
   • 
   • swansont
   • April 14

10. Monolith asteroids: a Silent Order.

    By GeeKay, April 5
    • 2 replies
    • 502 views
    • 
    • GeeKay
    • April 5

11. The Beginning of the Universe 1 2 3 4 6

    By Chris Sawatsky, November 12, 2023
    • 145 replies
    • 6.6k views
    • 
    • Mordred
    • April 5

12. Interview invitation for YouTube channel

    By Viktoriia, April 4
    • 1 reply
    • 418 views
    • 
    • swansont
    • April 4

13. Gravitational effect and pressure of photons in Friedmann equation?

    By icarus2, March 31
    • 12 replies
    • 955 views
    • 
    • Mordred
    • April 2

14. I really need your help with some calculations 1 2

    By tmdarkmatter, March 17
    • 28 replies
    • 1.6k views
    • 
    • tmdarkmatter
    • March 23

15. Expansion of space- Split from: Alabama court - "Embryos are people"

    By npts2020, March 1
    • 16 replies
    • 819 views
    • 
    • MigL
    • March 10

16. Novel Dark Matter & Energy Hypothesis

    By exchemist, March 9
    • 1 reply
    • 410 views
    • 
    • Genady
    • March 9

17. Airlines And Other Private Companies Going Into The Space Industry 1 2

    By Photon Guy, October 5, 2023
    • 45 replies
    • 2.6k views
    • 
    • TheVat
    • February 14

18. Bringing Samples Back From Mars

    By Photon Guy, January 31
    • 5 replies
    • 653 views
    • 
    • Ken Fabian
    • February 5

19. Could we observe the present ? 1 2

    By Time Traveler, February 1
    • 30 replies
    • 2.1k views
    • 
    • Phi for All
    • February 3

20. Object faster or just as fast as light

    By Irma, August 28, 2023
    • 16 replies
    • 1.4k views
    • 
    • Janus
    • January 30

21. Determining distance (split from Cosmic Megastructure Challenges Theories of the Universe

    By Luc Turpin, January 13
    • 0 replies
    • 304 views
    • 
    • Luc Turpin
    • January 13

22. Space Exploration Within Our Solar System

    By Chris Sawatsky, January 11
    • 2 replies
    • 393 views
    • 
    • Phi for All
    • January 12

23. Lunar lander mission leaking fuel from Vulcan rocket, mission in jeapardy

    By Paulsrocket, January 8
    • 0 replies
    • 188 views
    • 
    • Paulsrocket
    • January 8

24. How can a big bang expand to an infinite size? 1 2 3 4 5

    By Airbrush, November 25, 2023
    • 116 replies
    • 7.4k views
    • 
    • Markus Hanke
    • January 8

25. How is it known that the CMB is everywhere in the Universe when

    By Paulsrocket, January 3
    • 10 replies
    • 870 views
    • 
    • MigL
    • January 4