Third Planet

The third planet refers to Earth in our solar system. It is the only planet known to support life and is the fifth largest planet in the solar system.

Characteristics of the Third Planet

Earth has a unique set of characteristics that make it suitable for life:

• Atmosphere: Earth has a protective atmosphere that contains the right amount of oxygen for living organisms to breathe.
• Water: The presence of liquid water on Earth's surface is essential for life as we know it.
• Temperature: Earth has a moderate temperature range that allows for the existence of diverse ecosystems.
• Magnetosphere: Earth's magnetic field protects the planet from harmful solar radiation.

Earth's Place in the Solar System

Earth orbits the Sun at an average distance of about 93 million miles (150 million kilometers). It takes approximately 365.25 days to complete one orbit around the Sun, which defines a year on Earth.

Study Guide

Here are some key points to remember about the third planet:

1. What is the third planet in the solar system?
2. What makes Earth unique compared to other planets?
3. How does Earth's atmosphere support life?
4. What role does Earth's magnetic field play in protecting the planet?
5. How long does it take for Earth to orbit the Sun?