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Physics, 06.12.2020 09:50 emilysmith20044

(Subject is Astronomy, but that's not an option.) What part of GAIA is used to determine the angular positions of stars to better measure their distances and motions?

A. The radial-velocity instrument
B. The infrared light instrument
C. The photometric instrument
D. The astrometry instrument

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(Subject is Astronomy, but that's not an option.) What part of GAIA is used to determine the angula...
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