GRAVITY (Very Large Telescope)

VLTI GRAVITY
Beam Combining Instrument (BCI), which is the main part of GRAVITY from the outside
BCI with the cover removed

GRAVITY is an instrument on the interferometer of the Very Large Telescope (VLTI). It either combines the light of the four Unit Telescopes (UT) or the smaller four Auxiliary Telescopes. The instrument works with adaptive optics and provides a resolution of 4 milliarcseconds (mas) and can measure the position of astronomical objects down to a few 10 microarcseconds (μas). VLTI GRAVITY has a collecting area of 200 m2 and the angular resolution of a 130 m telescope.

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