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The Kepler space telescope (depicted), designed to discover Earth-like planets orbiting other stars, was launched.
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Kepler space telescope
NASA space telescope for exoplanetology (2009–2018)
The Kepler space telescope is a defunct space telescope launched by NASA in 2009 to discover Earth-sized planets orbiting other stars. Named after astronomer Johannes Kepler, the spacecraft was launched into an Earth-trailing heliocentric orbit. The principal investigator was…Source: Wikipedia (CC BY-SA)
Terrestrial planet
Planet that is composed primarily of silicate rocks or metals
A terrestrial planet, tellurian planet, telluric planet, or rocky planet, is a planet that is composed primarily of silicate, rocks or metals. Within the Solar System, the terrestrial planets accepted by the International Astronomical Union are the inner planets closest to the…Source: Wikipedia (CC BY-SA)