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luminous starsJW Player
•70% Informative
Gaia's main objective is to determine the positions, motions and distances of billions of stars.
When the images of the stars from Gaia 's telescopes move across the focal plane, their positions at a given time are determined by the light sensitive astrometric CCDS .
Subsequently, the light from the star passes through prisms producing low resolution Spectra , helping us to determine, for example, the temperature of the star.
The stars were identified by their peculiar motion and chemical composition.
They are the remains of a dwarf Galaxy called Gyre Enceladus that merged with our Milky Way about 8 to 11 billion years ago .
These stars illustrate that the Galaxy in which we live is an ever changing system.
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