Planet
Planetary science explores the formation, classification, and diversity of bodies orbiting stars, ranging from terrestrial worlds to gas giants.
Images
Planet
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History
The transition from geocentrism to heliocentrism changed our view of Earth. Recent discoveries in the Kuiper belt led to the reclassification of Pluto as a dwarf planet.
Examples
The Solar System contains eight planets, while over 5,900 exoplanets have been discovered in other star systems.
Overview
The IAU defines a planet as a body that orbits a star, is massive enough to be rounded by its own gravity, and has cleared its orbital neighborhood.
Importance
Exoplanet research reveals diverse systems, such as 'hot Jupiters,' which challenge our understanding of how planetary systems evolve.
How It Works
The nebular hypothesis explains that planets form via accretion within a protoplanetary disk surrounding a protostar.
See also
Frequently Asked Questions
What is a planet?+
A planet is a giant, round object in space that travels around a star.
How do scientists know something is a planet?+
Scientists define planets by their size, shape, and how they cleared their orbital path.
Where does Earth belong?+
Earth is one of these amazing worlds that orbit a star.
What kinds of planets are there?+
Planetary science studies planets ranging from terrestrial worlds to gas giants.
Why do planets travel around stars?+
Planets travel around stars because they are celestial bodies that orbit stars.
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