Elementary Academics

1. The Solar System
Science
Third Grade

2. The solar system is the sun and
the objects that orbit around it.

3. The sun is the center of the solar
system. It is a star.

4. Planets
A planet is a large body of rock or
gas that orbits the sun.
The solar system has nine planets,
including Earth.

5. Planets
Mercury Venus Earth
Mars Jupiter Saturn
Uranus Neptune Pluto

6. Inner Planets
• 1. Mercury
• 2. Venus
• 3. Earth
• 4. Mars
• They are the four planets closest to the sun.

7. Inner Planets
They all have rocky surfaces, and
they are warmer than the outer
planets.

8. Earth is different from the other
inner planets. It has a watery
surface. It is the only planet with
a lot of oxygen in its atmosphere.
Earth has plant life and animal
life.

9. Earth

10. Outer Planets
• 1. Jupiter
• 2. Saturn
• 3. Uranus
• 4. Neptune
• 5. Pluto

11. Outer Planets are made mostly of
frozen gases. Their surfaces are
colder than the inner planets
because they are farther away
from the sun. Most outer planets
have many moons.

12. Pluto
is different from other outer
planets. It is the smallest planet
in the solar system.

13. Other objects in the solar system
• Asteroids are chunks of rock or metal that
orbit the sun.
• Comets are large balls of ice and dust that
orbit the sun.