Speaking of low temperatures, the JWST has reached L2. Not quite ready for full operation though, as the cold side - currently -202°C, about 70K - needs to be lower than 50K. And the 18 segments of the mirror still need to be aligned.
Orbital Insertion Burn a Success, Webb Arrives at L2 – James Webb Space Telescope
Why will it take six months to see JWST's… | The Planetary Society
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“the mirror segments move at the same rate that a blade of grass grows.”
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