Astronomy and Cosmology

3713 topics in this forum

1. Big bang expansion (split from Time is a bubble)

   By QuantumT, December 28, 2020
   • 3 replies
   • 717 views
   • 
   • MigL
   • December 28, 2020

2. Expansion/Inflation and the Separation Velocity

   By geordief, December 26, 2020
   • 8 replies
   • 1.4k views
   • 
   • Markus Hanke
   • December 27, 2020

3. Cosmic Background Radiation and the Electromagnetic Field

   By geordief, December 25, 2020
   • 11 replies
   • 1.2k views
   • 
   • joigus
   • December 26, 2020

4. Cosmic Background Radiation and DM

   By geordief, December 24, 2020
   • 10 replies
   • 1.1k views
   • 
   • J.C.MacSwell
   • December 25, 2020

5. The Europa Fish & Chips Shop

   By Gian, December 9, 2020
   • 5 replies
   • 1.1k views
   • 
   • Gian
   • December 14, 2020

6. Can Antimatter explain Dark Energy and Dark Matter?

   By Asehgal33, December 7, 2020
   • 6 replies
   • 1.4k views
   • 
   • J.C.MacSwell
   • December 7, 2020

7. Geologically Recorded Asteroid Impacts...

   By Orion1, December 5, 2020
   • 1 reply
   • 719 views
   • 
   • swansont
   • December 5, 2020

8. Negative dimension / antispace

   By Mr Antykox, November 18, 2020
   • 6 replies
   • 1.2k views
   • 
   • Airbrush
   • December 3, 2020

9. Gravitational waves embossed on Europa?

   By robert1978bp, November 23, 2020
   • 11 replies
   • 1.3k views
   • 
   • Janus
   • November 24, 2020

10. Antidimension

    By Mr Antykox, November 22, 2020
    • 5 replies
    • 1.2k views
    • 
    • Moontanman
    • November 23, 2020

11. Neutron Star Astrochemistry

    By Anchovyforestbane, November 17, 2020
    • 2 replies
    • 842 views
    • 
    • Anchovyforestbane
    • November 17, 2020

12. Astrochemical Thought Experiment

    By Anchovyforestbane, November 17, 2020
    • 0 replies
    • 574 views
    • 
    • Anchovyforestbane
    • November 17, 2020

13. Hypothetical sci-fi question about wormholes and elapsed time between the 2 points 1 2

    By Pmfr, October 29, 2020
    • 35 replies
    • 128.4k views
    • 
    • Pmfr
    • November 15, 2020

14. if there was a rogue black hole hurtling towards us would we know?

    By boo, October 23, 2020
    • 3 replies
    • 1.1k views
    • 
    • Airbrush
    • November 14, 2020

15. how much of the outer universe can we see from where we are?

    By boo, October 21, 2020
    • 14 replies
    • 2.1k views
    • 
    • Airbrush
    • November 2, 2020

16. Is there the proof of heliocentrism? 1 2

    By molbol2000, October 18, 2020
    • 30 replies
    • 103.5k views
    • 
    • CharonY
    • October 19, 2020

17. How do concentrations of dark matter arise? 1 2

    By Eise, October 1, 2019
    • 48 replies
    • 28.4k views
    • 
    • swansont
    • October 15, 2020

18. Gravity of a black hole (split from How large would a black hole need to be to overcome inflation and pull all matter one day into a big crunch?

    By Charles 3781, October 12, 2020
    • 9 replies
    • 1.1k views
    • 
    • Markus Hanke
    • October 15, 2020

19. Black Holes and Penrose's CCC

    By geordief, October 11, 2020
    • 0 replies
    • 744 views
    • 
    • geordief
    • October 11, 2020

20. Penrose's CCC

    By QuantumT, October 10, 2020
    • 1 reply
    • 1k views
    • 
    • Markus Hanke
    • October 11, 2020

21. There should be a Real-Time Broadcasting / Streaming of Our Solar System

    By tylers100, October 8, 2020
    • 3 replies
    • 866 views
    • 
    • tylers100
    • October 8, 2020

22. I think I have understood what the cosmological constant problem corresponds to.

    By stephaneww, September 30, 2020
    • 1 reply
    • 741 views
    • 
    • swansont
    • September 30, 2020

23. Earth to Venus

    By Gian, September 25, 2020
    • 7 replies
    • 1.7k views
    • 
    • Endy0816
    • September 26, 2020

24. Steering to the stars

    By Gian, September 17, 2020
    • 3 replies
    • 1.1k views
    • 
    • swansont
    • September 25, 2020

25. The mass of planet Earth divided by it's radius=it's gravity?

    By Hello2, September 14, 2020
    • 2 replies
    • 992 views
    • 
    • Halc
    • September 14, 2020