2020-01-16

@SPEXcast @SciGuySpace What’s amazing is how non-linear the effect of gravity is. Starship can travel by itself from surface of Mars to surface of Earth, but requires massive booster on Earth with orbital refilling to get to Mars, which is ~38% of Earth gravity.

@SPEXcast @SciGuySpace Densification isn’t needed to return the ship & limited cargo from Mars, but it’s an option for increasing cargo return capability if needed

@SciGuySpace Fundamental issue with SLS is that it’s not reusable, which means that a billion dollar rocket is blown up every launch! 💯 tragedy.

@SciGuySpace Densifying hydrogen is difficult, as its liquid temp is close to absolute zero. Much easier with CH4, which is an underappreciated advantage. Cooling O2 is good too, but becomes operationally difficult at N2 liquid temp, as air is ~78% N2. Entire system wants to drip air!

@Teslarati Sorry, migh have brought the site down

Starship orbital vehicle SN1, liquid oxygen header tank & nosecone https://t.co/IaSEdIyZgP