Physics, Space Science and Theories

1,513 topics in this forum

1. A Determination of a Preliminary Orbit from Four Observations

   By David Sims, September 14, 2020
   • 0 replies
   • 120 views
   • 
   • David Sims
   • September 14, 2020

2. Stellar Parallax

   By Anakin Skywalker, June 15, 2020
   • 12 replies
   • 522 views
   • 
   • Anakin Skywalker
   • August 31, 2020

3. measuring stellar distance for the intellectually challenged

   By asset189, July 15, 2014
   • 10 replies
   • 1k views
   • 
   • Tenor Viol
   • August 31, 2020

4. Looking for a book on Stellar Evolution

   By Starwatcher2001, August 13, 2020
   • 13 replies
   • 428 views
   • 
   • Synchronicity
   • August 26, 2020

5. Is Interstellar Travel Possible? 1 2

   By alberto91, August 21, 2020
   • 40 replies
   • 906 views
   • 
   • Rusted
   • August 25, 2020

6. Dark adaptation - more than meets the eye?

   By jambouk, August 18, 2020
   • 14 replies
   • 338 views
   • 
   • markse68
   • August 23, 2020

7. Elliptical Transfer-Intercept Orbits: Non-Hohmann Transfer Orbits that Take You Somewhere

   By David Sims, August 17, 2020
   • 0 replies
   • 181 views
   • 
   • David Sims
   • August 17, 2020

8. Scientists deserve to be Entertained too! :P

   By Macavity, August 8, 2020
   • 0 replies
   • 189 views
   • 
   • Macavity
   • August 8, 2020

9. I designed a crewed interstellar spacecraft

   By alberto91, July 4, 2020
   • 5 replies
   • 383 views
   • 
   • Zakalwe
   • August 7, 2020

10. Interview about new proposed interstellar spacecraft

    By alberto91, August 7, 2020
    • 0 replies
    • 145 views
    • 
    • alberto91
    • August 7, 2020

11. Supernova 1987A is a neutron star

    By PaulM, August 4, 2020
    • 5 replies
    • 201 views
    • 
    • Tenor Viol
    • August 4, 2020

12. My arXiv preprint on a crewed interstellar spacecraft

    By alberto91, July 25, 2020
    • 2 replies
    • 135 views
    • 
    • LukeSkywatcher
    • July 25, 2020

13. Question Supernova remnant

    By Marvin Jenkins, July 22, 2020
    • 4 replies
    • 283 views
    • 
    • robin_astro
    • July 24, 2020

14. Question re binary star systems

    By Kate_C, July 16, 2020   

    • binary star
    • binary star sytem
    • (and 6 more)

      Tagged with:

      • binary star
      • binary star sytem
      • planets
      • stars
      • sunset
      • sunrise
      • sunrise sunset duration
      • science fiction
    • 3 replies
    • 304 views
    • 
    • Sunshine
    • July 19, 2020

15. Make your own Particle Detector

    By Macavity, May 14, 2020
    • 16 replies
    • 553 views
    • 
    • saac
    • July 7, 2020

16. Bizarre tennis racket rotation :D

    By Macavity, July 5, 2020
    • 4 replies
    • 267 views
    • 
    • Stub Mandrel
    • July 6, 2020

17. Meteorite? Identification help.

    By Marvin Jenkins, July 4, 2020
    • 4 replies
    • 286 views
    • 
    • Marvin Jenkins
    • July 5, 2020

18. Kezzba's Hypothesis=Planet 9 a black hole.

    By Kezzba, October 20, 2017   

    • theorys
    • planet 9
    • (and 1 more)

      Tagged with:

      • theorys
      • planet 9
      • black hole
    • 7 replies
    • 782 views
    • 
    • Kezzba
    • June 30, 2020

19. What came before the Big Bang 1 2 3 4 6

    By Scotti G, May 21, 2020
    • 136 replies
    • 2.9k views
    • 
    • saac
    • June 10, 2020

20. CERN Physics before the LHC

    By Macavity, April 3, 2020
    • 7 replies
    • 470 views
    • 
    • Macavity
    • May 19, 2020

21. Light units and information 1 2

    By jetstream, May 8, 2020
    • 40 replies
    • 674 views
    • 
    • jetstream
    • May 10, 2020

22. Black hole detected just 1,000 light-years from Earth

    By Waddensky, May 7, 2020
    • 0 replies
    • 241 views
    • 
    • Waddensky
    • May 7, 2020

23. Tails

    By Michael Kieth Adams, April 20, 2020
    • 6 replies
    • 416 views
    • 
    • Michael Kieth Adams
    • April 25, 2020

24. Two Planets in Same Orbit?

    By Sunshine, January 10, 2020
    • 9 replies
    • 822 views
    • 
    • leibek
    • April 10, 2020

25. 'Dissecting' a distant galaxy

    By Ships and Stars, April 2, 2020
    • 7 replies
    • 287 views
    • 
    • leibek
    • April 10, 2020