Science & Spaceflight

8,482 topics in this forum

1. Possible mostly renewable energy source?

   By Ultimate Steve, October 25, 2017
   • 10 replies
   • 989 views
   • 
   • magnemoe
   • October 26, 2017

2. Decision making based on mechanical energetics

   By PB666, October 26, 2017   

   • mechanical energy
   • delta-v
   • (and 3 more)

      Tagged with:

     • mechanical energy
     • delta-v
     • eccentricity
     • inclination
     • hohmann
   • 0 replies
   • 570 views
   • 
   • PB666
   • October 26, 2017

3. Fuel/DV safety margins for real spacecraft

   By Tyko, October 25, 2017
   • 7 replies
   • 808 views
   • 
   • KSK
   • October 26, 2017

4. Blue Super-Giant Stars! 1 2

   By Deathsoul097, December 8, 2013
   • 27 replies
   • 14.3k views
   • 
   • YNM
   • October 26, 2017

5. The Nature of Kepler-1625 b-i

   By ProtoJeb21, October 25, 2017
   • 0 replies
   • 527 views
   • 
   • ProtoJeb21
   • October 25, 2017

6. Who Were the Recovery Divers (Gemini 4)?

   By Nikolai, October 25, 2017
   • 3 replies
   • 713 views
   • 
   • LordFerret
   • October 25, 2017

7. Subsurface Magma Oceans caused by Induction Heating on the TRAPPIST-1 Planets

   By ProtoJeb21, October 24, 2017   

   • dont dig down
   • 7 replies
   • 1.1k views
   • 
   • Green Baron
   • October 25, 2017

8. LANCER [Venus] [Illustrations] [My frustrations]

   By cratercracker, October 7, 2017
   • 7 replies
   • 1.6k views
   • 
   • PB666
   • October 23, 2017

9. What if an Earth-mass object slammed into the sun at 50% the Speed of Light.

   By daniel l., October 21, 2017
   • 23 replies
   • 1.5k views
   • 
   • p1t1o
   • October 23, 2017

10. Greening the world's deserts and reversing Climate Change 1 2

    By SpaceMouse, October 21, 2017   

    • climate change
    • desert
    • (and 2 more)

       Tagged with:

      • climate change
      • desert
      • grassland
      • livestock
    • 29 replies
    • 2.2k views
    • 
    • mikegarrison
    • October 23, 2017

11. Is eccentricity a vector?

    By Rareden, October 18, 2017   

    • vector
    • math
    • (and 2 more)

       Tagged with:

      • vector
      • math
      • space
      • orbit
    • 19 replies
    • 3.1k views
    • 
    • Rareden
    • October 23, 2017

12. Polar Orbits

    By The Man Myth and Legend, October 22, 2017
    • 8 replies
    • 1.2k views
    • 
    • kerbiloid
    • October 23, 2017

13. New AI can guess whether you're gay or straight from a photograph?

    By Pawelk198604, October 23, 2017   

    • ai
    • it
    • (and 1 more)

       Tagged with:

      • ai
      • it
      • computers
    • 7 replies
    • 1k views
    • 
    • Vanamonde
    • October 23, 2017

14. I have question about Apollo Era mission control center?

    By Pawelk198604, October 21, 2017   

    • houston
    • nasa
    • 9 replies
    • 2.1k views
    • 
    • DerekL1963
    • October 23, 2017

15. Specific Mechanical Energy

    By PB666, October 21, 2017   

    • energy velocity escape transfer
    • 0 replies
    • 946 views
    • 
    • PB666
    • October 21, 2017

16. SpaceX SFR: The Small Falcon Rocket 1 2

    By MatterBeam, October 18, 2017   

    • spacex
    • launch
    • 44 replies
    • 7.6k views
    • 
    • mikegarrison
    • October 20, 2017

17. Camera system for Mariner 4

    By phoneix_007, October 17, 2017
    • 18 replies
    • 1.8k views
    • 
    • Zeiss Ikon
    • October 19, 2017

18. Apollo Archeology

    By MrChumley, October 19, 2017   

    • apollo
    • rope memory
    • (and 1 more)

       Tagged with:

      • apollo
      • rope memory
      • as-202
    • 6 replies
    • 1.2k views
    • 
    • KSK
    • October 19, 2017

19. J-20 Fighter stable or unstable canard airframe? 1 2

    By AeroGav, October 9, 2017   

    • j-20
    • chinese
    • (and 1 more)

       Tagged with:

      • j-20
      • chinese
      • fighter
    • 33 replies
    • 5.7k views
    • 
    • Boris-Barboris
    • October 19, 2017

20. The relevance of planets to an advanced civilization

    By daniel l., October 16, 2017
    • 13 replies
    • 1.2k views
    • 
    • kerbiloid
    • October 19, 2017

21. Mars or venus? 1 2 3 4

    By AHeroReborn, October 7, 2017
    • 95 replies
    • 6.9k views
    • 
    • Bill Phil
    • October 19, 2017

22. Understanding launcher's user's manual for interplanetary travel

    By MajorTomtom, October 17, 2017
    • 8 replies
    • 1.7k views
    • 
    • Bill Phil
    • October 18, 2017

23. IAC 2018

    By TheGuyNamedAlan, October 18, 2017   

    • 2018
    • iac
    • 1 reply
    • 818 views
    • 
    • NSEP
    • October 18, 2017

24. Apollo CM Dimensions

    By Cadet_BNSF, September 20, 2017
    • 17 replies
    • 6.9k views
    • 
    • PB666
    • October 17, 2017

25. Haumea has rings

    By insert_name, October 11, 2017
    • 18 replies
    • 1.8k views
    • 
    • cubinator
    • October 17, 2017