Planet

Planets are celestial bodies that orbit around a star. They do not produce their own light but reflect the light of the star they orbit. 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 atmospheric conditions.

Characteristics of Planets

1. Orbit: Planets orbit around a star in an elliptical path.
2. Size: Planets can range in size from small rocky planets to large gas giants.
3. Composition: Planets are made up of different materials, such as rock, metal, or gas.
4. Atmosphere: Some planets have an atmosphere that consists of gases, while others have little to no atmosphere.
5. Moons: Many planets have natural satellites, or moons, that orbit around them.

Solar System

The planets in our solar system are divided into two main groups based on their composition: terrestrial planets and gas giants. The four inner planets - Mercury, Venus, Earth, and Mars - are terrestrial planets, meaning they are rocky and have solid surfaces. The outer planets - Jupiter, Saturn, Uranus, and Neptune - are gas giants, consisting mainly of hydrogen and helium.

Studying Planets

Scientists study planets using telescopes, spacecraft, and rovers. By analyzing the composition, atmosphere, and geological features of planets, they can gain a better understanding of the formation and evolution of these celestial bodies.

Study Questions

1. What are the two main groups of planets in our solar system?
2. Which planet is known as the "Red Planet"?
3. What is the composition of gas giants?
4. How do scientists study planets?