Science Class 3 - Earth And-Universe Notes
Comprehensive study notes for Class 3 - Earth And-Universe olympiad preparation
Earth and Universe
Welcome to the chapter on Earth and Universe for Class 3. In this chapter, you will learn about our planet Earth, the solar system, and the universe. By the end of this chapter, you will know about planets, stars, and other amazing things in space!
Introduction
The Earth is our home. It is a planet in the solar system. The universe is everything around us—planets, stars, moons, and galaxies. Let’s explore the wonders of space!
What is the Universe?
The universe is very big. It has millions of stars, planets, and galaxies. Everything we see in the sky is part of the universe.
- Stars are big balls of hot gases.
- Galaxies are groups of stars and planets.
- The sun is a star.
The Solar System
The solar system is a group of planets and the sun. The sun is at the center. The planets move around the sun.
- There are eight planets in our solar system.
- Earth is the third planet from the sun.
- Other planets are Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune.
Our Planet Earth
- Earth is the only planet where life is known to exist.
- It has land, water, and air.
- Earth has one moon.
Other Objects in Space
- Moons go around planets.
- Asteroids are small rocky objects in space.
- Comets are balls of ice and dust that move around the sun.
Fun Activity: Make a Solar System Model
Use clay or paper to make the sun and planets. Arrange them in order from the sun!
Summary
- Earth is a planet in the solar system.
- The universe has stars, planets, moons, and galaxies.
- The sun is a star at the center of our solar system.
Practice Questions
- Name three planets in our solar system.
- What is the sun?
- How many moons does Earth have?
- What is an asteroid?
- What do comets look like?
Challenge Yourself
- Draw and label the solar system.
- Find out which planet is the largest in our solar system.
Did You Know?
- Jupiter is the largest planet in our solar system!
- The sun gives us light and heat.
Glossary
- Universe: Everything in space—stars, planets, galaxies.
- Solar System: The sun and the planets that move around it.
- Planet: A large round object that moves around a star.
- Star: A big ball of hot gases that gives off light.
- Asteroid: A small rocky object in space.
- Comet: A ball of ice and dust that moves around the sun.
Answers to Practice Questions
- Earth, Mars, Jupiter (any three planets).
- The sun is a star.
- One.
- An asteroid is a small rocky object in space.
- Comets look like bright balls with tails.
The universe is full of wonders! Keep exploring and learning about space.