Kepler Telescope

Kepler is a retired space observatory launched by NASA to discover Earth-size planets orbiting other stars. Named after astronomer Johannes Kepler, the spacecraft was launched on March 7, 2009, into an Earth-trailing heliocentric orbit. The principal investigator was William J. Borucki.
Kepler observed 530,506 stars and discovered 2,662 exoplanets over its lifetime.[15] A newer NASA mission, TESS, launched in 2018, is continuing the search for exoplanets.[43]
Wikipedia
 
After nine years in deep space collecting data that indicate our sky to be filled with billions of hidden planets - more planets even than stars - NASA's Kepler space telescope has run out of fuel needed for further science operations NASA

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