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Earth is the third planet from the Sun , and the densest and fifth-largest of the eight planets in the Solar System . It is also the largest of the Solar System's four terrestrial planets .
Venus is the second planet from the Sun , orbiting it every 224.7 Earth days. [ 11 ] The planet is named after the Roman goddess of love and beauty. After the Moon , it is the brightest natural object in the night sky, reaching an apparent magnitude of −4.6, bright enough to cast shadows. [ 13 ] Because Venus is an inferior planet from Earth, it never appears to venture far from the Sun: its elongation reaches a maximum of 47.8°. Venus reaches its maximum brightness shortly before sunrise or shortly after sunset, for which reason it has been referred to by ancient cultures as the Morning Star or Evening Star. Venus is classified as a terrestrial planet and is sometimes called Earth's "sister planet" owing to their similar size, gravity, and bulk composition (Venus is both the closest planet to Earth and the planet closest in size to Earth). However, it has been shown to be very different from Earth in other respects.
Mercury is the innermost planet in the Solar System , named after the Roman god Mercury , the messenger to the gods.
Neptune is the eighth and farthest planet from the Sun in the Solar System . It is the fourth-largest planet by diameter and the third-largest by mass.
Saturn is the sixth planet from the Sun and the second largest planet in the Solar System , after Jupiter . Named after the Roman god Saturn , its astronomical symbol ( ♄ ) represents the god's sickle . Saturn is a gas giant with an average radius about nine times that of Earth . [ 12 ] [ 13 ] While only one-eighth the average density of Earth, with its larger volume Saturn is just over 95 times more massive than Earth. [ 14 ] [ 15 ] [ 16 ]
Uranus is the seventh planet from the Sun . It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System . Uranus is similar in composition to Neptune , and both are of different chemical composition than the larger gas giants Jupiter and Saturn .
Animation of Mars's rotation from the vantage of an observer who moves south, then north, to hover over both poles, showing the planet's major topographic features.
Jupiter is the fifth planet from the Sun and the largest planet in the Solar System . [ 13 ] It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in the Solar System combined.