Planet
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A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. The Solar System has eight planets by th
The eight planets of the Solar System with size to scale (up to down, left to right): Saturn, Jupiter, Uranus, Neptune (outer planets), Earth, Venus, Mars, and Mercury (inner planets)
A protoplanetary disk
Protoplanets colliding during planet formation
Earth's atmosphere
Earth
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Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is made possible by Earth being an ocean world, the only one in the Solar System sustaining liquid su
Planet
…dwarf, and is not one itself. The Solar System has eight planets by the most restrictive definition of the term: the terrestrial planets Mercury, Venus, Earth, and Mars, and the giant planets Jupiter, Saturn, Uranus, and Neptune. The best available theory of planet formation is the nebular hypothesis, which…
Earth as seen from Meteosat-12 in 2025, during the March equinox
Pale orange dot, an impression of Early Earth, featuring its tinted orange methane-rich early atmosphere
A conception of the scorched Earth after the Sun has entered the red giant phase, about 5–7 billion years in the future