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SpectralMagic t1_je5604b wrote

Baffling how we can detect the presence of planets billions of kilometers away. The precision involved is probably ridiculous


danielravennest t1_je6fqtg wrote

Even low-grade hobby telescopes are polished to 1/16 micron (2.5 millionths of an inch). Serious telescopes are several times more accurate. Optics inherently have to be very precise.