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- Eight planets in our solar system: Mercury , Venus , Earth , Mars , Jupiter , Saturn , Uranus, and Neptune .
- Easy way to memorize: M Y V ERY E FFICIENT M OTHER J UST S ERVED U S N UTS .
- Planets move around the sun in orbits . Mercury is the nearest , Venus is Earth's twin , and Pluto is a dwarf planet .
- Pluto was a planet until 2006. Then, the International Astronomical Union decided to call it and similar objects dwarf planets.
- Planets are classified into two groups:
- Inner planets : Mercury, Venus, Earth, and Mars. Close to the sun, made of rocks, also known as terrestrial planets.
- Outer planets : Jupiter, Saturn, Uranus, and Neptune. Far from the sun, made of gases, also known as gas giants .
- Planets are heavenly bodies, with no own heat and light, shine by reflecting the sun’s light, and are spherical in shape.
- Planets revolve around the sun from west to east and rotate on their axes.
