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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 planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis ...
Orbital speed. 720,000 km/h (450,000 mi/h) [8] Orbital period. ~230 million years [8] The Solar System [b] is the gravitationally bound system of the Sun and the objects that orbit it. [9] It was formed 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.
The formation and evolution of the Solar System is a fascinating topic that explores how our planetary system originated from a giant cloud of gas and dust, and how it has changed over billions of years. Learn about the theories and evidence that explain the origin of the Sun, the planets, the asteroids, the comets, and the other celestial bodies that orbit the Sun. Discover how the Solar ...
An artist's concept of a planetary system. A planetary system is a set of gravitationally bound non-stellar objects in or out of orbit around a star or star system.Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals and ...
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine-and-a-half times that of Earth. [26] [27] It has only one-eighth the average density of Earth, but is over 95 times more massive.
At that time, Uranus, Neptune, nor the asteroid belts have been discovered yet. Discovery and exploration of the Solar System is observation, visitation, and increase in knowledge and understanding of Earth 's "cosmic neighborhood". [1] This includes the Sun, Earth and the Moon, the major planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus ...
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