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Why doesn't NASA fly its rockets on suborbital trajectories to the Moon?

A "suborbital" trajectory to the moon could be done--simply never raise your periapsis above 0. However, there's no reason to. By the time you're at the moon the difference between a ...
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1 vote

Algae Bioreactor for O2 and CO2 (and food?) - Any data on required size and power requirements?

Energy requirement: BIG According to Wikipedia https://en.wikipedia.org/wiki/Photosynthetic_efficiency , the maximum theoretical photosynthetic efficiency of plants using sunlight is 11%, but due to ...
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How brightly does Venus's hot surface glow at night? Could you see it? Could you see well enough to walk around?

No. You could not see by blackbody radiation in either IR or visible regardless of brightness. To be able to “see” something depends on both brightness and contrast. There may be enough radiation (...
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