Hipparcos satellite

Hipparcos satellite

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Credit: EUROPEAN SPACE AGENCY/SCIENCE PHOTO LIBRARY

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Caption: Hipparcos satellite. This satellite, the high precision parallax collecting satellite (Hipparcos), was launched by the European Space Agency on 8th August 1989 and operated until August 1993. It measured the position, distance (parallax) and proper motion (the change in a star's position over time) of over 120,000 stars, 200 times more accurately than before. A set of catalogues containing the Hipparcos data were released in 1997. This data has been used to show that our galaxy, the Milky Way, is changing shape, to confirm Einstein's prediction of the effect of gravity on starlight and to predict the impacts of the comet Shoemaker-Levy 9 on Jupiter.Restrictions:

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Keywords: 1990s, 20th century, astrometry, astronomical, astronomy, astrophysical, astrophysics, equipment, esa, experiment, high precision parallax collecting satellite, hipparcos, instrument, machine, measurement 1989, mission, satellite

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