Space probes have gone near or landed on all planets in our solar system. In recent decades better telescopes have found planets in solar systems other than are own: exoplanets. One of the first was a planet found to be orbiting Barnard's star.
Planetary science in a broad sense includes finding a planet's orbital period and orbital distance from its star, the mineral makeup of the planet, and an attempt to learn its age. It may also have a more narrow focus, such as the mapping of the planet's surface features and the makeup of its atmosphere.
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- Planetology -Citizendium