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Book 7: Chapter 22 – Mysterious Universe


  1. Mars is the fourth planet from the Sun in the Solar System. Named after the Roman god of war, Mars, it is often described as the "Red Planet" as the iron oxide prevalent on its surface gives it a reddish appearance.

  2. Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. Jupiter is classified as a gas giant along with SaturnUranus and Neptune. Together, these four planets are sometimes referred to as the Jovian or outer planets.

  3. Mercury is the innermost and smallest planet in the Solar System. It orbits the Sun once every 87.969 Earth days.

  4. Earth (or the Earth) is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. Earth formed approximately 4.54 billion years ago.

  5. Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It is sometimes called Earth's "sister planet" due to the similar size, gravity and bulk composition. 

  6. Pluto is the second-most-massive known dwarf planet in the Solar System (after Eris) and the tenth-most-massive body observed directly orbiting the Sun

  7. 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.

  8. Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Saturn is a gas giant with an average radius about nine times that of Earth.

  9. Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System.

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