Sun–Earth L2 · 1.5 million km
James Webb Space Telescope
Launched25 Dec 2021
Mirror6.5 m, 18 segments
OrbitHalo orbit around L2
Distance~4× the Moon
An infrared observatory. Its sunshield keeps the optics below 50 K.
Webb can study distant Kuiper Belt objects, but a Planet Nine search needs a wide survey like Rubin. Placement here is schematic.
Sources
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