Planet

A planet is a celestial body that orbits a star, is spherical in shape due to its own gravity, and has cleared its orbital path of other debris. In our solar system, there are eight recognized planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. These planets vary in size, composition, and other characteristics.

Characteristics of Planets

1. Orbit: Planets orbit a star, such as our Sun, following an elliptical path.
2. Spherical Shape: Planets are nearly spherical in shape due to the force of gravity pulling their mass inward.
3. Cleared Orbit: Planets have cleared their orbital path of other debris, meaning they have become gravitationally dominant in their orbital zone.
4. Size and Composition: Planets vary in size and composition. Some are rocky, like Earth, while others are gas giants, like Jupiter and Saturn.
5. Rotation: Planets rotate on their axes, causing day and night cycles.
6. Atmosphere: Many planets have atmospheres, which can vary in density and composition.

Study Guide for Planets

• What is the definition of a planet?
• How many recognized planets are there in our solar system?
• What are the names of the eight recognized planets in our solar system?
• What are the key characteristics of planets?
• How do planets differ in terms of size and composition?
• What role does gravity play in shaping a planet's spherical form?
• Why is it important for a planet to have cleared its orbital path?

[Planet] Related Worksheets and Study Guides:

• Our Solar SystemScience • Seventh Grade
• The Sun-Earth-Moon SystemScience • Seventh Grade