ToughSFさんのイラストまとめ

Aerobraking at Mars is a real challenge.
Its atmosphere is a small target and very thin, and its density can change by x2, while the first pass must bring the spacecraft to within the 5km/s escape velocity so that multiple passes become possible.
https://t.co/wHrUXhE4lF

Solid anti-hydrogen is shot at a sail coated in uranium to create an interstellar propulsion system. Exhaust velocity is variable, engine mass is minimal and the antimatter amount needed is tiny.
https://t.co/cEN8QjQyJW
https://t.co/NhC92cICvo

Frostpunk's concept art for a small settlement in a pit of ice, huddled around a heat source, resembles somewhat a colony on the surface of an icy moon.
#art by Jakub Kowalczyk.
https://t.co/jm2urqDTel

How does the mantle keep its 4 billion trillion tons of rock hot and moving?
It's the exchange of terawatts of energy between the core and the surface.
13.5 TW are thanks to the gravitational potential energy of sinking plates in subduction zones.
https://t.co/JdNbULpEbp

The Boeing 747 was once considered for use as a mobile cruise missile or ICBM launcher in the 60s.
It could even extend the range of ICBMs by 25% compared to a ground launch, while being pretty safe from counter-attack.
https://t.co/II8dCZJQbv

The rule of 69:
The ratio of the energy available from burning fuel to the energy contained in air entering a hypersonic engine is 69 divided by Mach number squared.
At Mach 8.3, the limit for ramjet speeds, they are about equal.
https://t.co/XjVqmwDOGk
https://t.co/PSTB3sfbh9

When you picture space, what does it look like?
It's not the few details our eyes can see, or raw data from telescope. It will be a mental image that can be more beautiful and inspiring than any real view.
#space #art by TolyanMy
https://t.co/JReDoZniM7

Article by @StartsWithABang on how WMAP and then Planck gave us better views of the cosmic background radiation, allowing us to determine the shape and size of the universe, and what exactly it contains.
https://t.co/FNh6iJSmA0

Chinese private launch firm Galactic Energy is ready its Ceres 1 rocket for launch.
https://t.co/h1urDhmm2a
https://t.co/qTKIdIciL3
It will cost $4M to deliver 350kg to LEO on the top of three HTPB solid rocket stages and an unknown liquid fuel fourth stage.

The Westland G-LYNX helicopter that achieved the world record of 400 km/h did so thanks to a special paddle-tip 'BERP' rotor blade that now equips the Royal Navy's Merlins.
It increases lift and delays retreating blade stall.
https://t.co/HXwvzGDN2X
https://t.co/6m7nO1gvDm