The temperature was the key physical property in determining the two categories of planets during solar system formation.
The solar system is a gravitationally bound system of the sun and the objects that orbit it. 4.6 billion years ago, a giant interstellar molecular cloud was formed by gravitational collapse. Most of the mass of this system is in the Sun, with most of the rest in Jupiter.
The Solar System is a collection of planets, moons, asteroids, comets, dust and gas orbiting our nearby star, the Sun. This includes the rocky inner planets of Mercury, Venus, Earth, and Mars. The gas giants Jupiter and Saturn. And the ice giants Uranus and Neptune.
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