What are the three main parts that gaia is composed of?

the astrometry instrument, the infrared light instrument, and the pulsar camera

detailed drawings, the pulsar instrument, and the luminosity dust

the astrometry instrument, the photo-metric instrument, and the radial-velocity spectrometer

the photometric instrument, the star catalogue, and the quasars

GAIA is composed of the astrometry instrument, the photo-metric instrument, and the radial-velocity spectrometer.

Option C

Explanation:

European Space Agency have formed an observatory in 2013 related to space and it is named as GAIA. Mostly that observatory is designed from astrometry. Astrometry is the measure of positions, distances and motion of stars. So the payload of GAIA is composed of three main parts.

They are astrometry instrument for finding the location of stars, photo-metric instrument for luminous measurements and radial velocity spectrometer for velocity measurement. So all the three instruments were used to analyze the position, brightness and speed of the motion of stars in the space.