Gaia in a nutshell Zoom Image
Gaia in a nutshell

Science Objectives

Gaia is obtaining astrometric, photometric, and spectroscopic information on over one billion stars in our Galaxy, as well as galaxies, quasars, and solar system objects.


  • the astrometric intrument measures positions, parallaxes, and proper motions. [more]
  • the two spectrophotometric instruments obtain low-resolution spectra in optical band. [more]
  • the radial velocity spectrometer measures the Doppler shift from high-resolution spectra. [more]

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