Solar System
The Sun and Planets in Orbit
Inner and Outer Planets
Space Rocks
Misc.
100

The Sun and the objects that are traveling around it

Solar System

100

The force of attraction between an object and another object 

Gravity

100

The third planet from the Sun

Earth

100

The outer planets are beyond the

Asteroid Belt

100

Groups of stars that form patterns in the sky

Constellations

200

The nine largest objects that travel around the Sun

Planets

200

The Sun provides us with

Heat and Light

200

The inner planets are closest to 

The Sun

200

Small, rocky, minor planets that orbit the Sun in the asteroid belt

Asteroids

200

Earth's nearest neighbor

The Moon

300

The time needed for one complete trip of a planet around the Sun

A year

300

The tendency of a moving object to keep moving in a straight line

Inertia

300

The only planet that has the right temperature and resources for life as we know it

Earth

300

Space rocks that reach the ground

Meteorites
300

The Sun is composed mostly of 

Hydrogen and Helium

400

The path a planet travels as it goes around the Sun

Orbit

400

The Sun's light shines differently throughout the year because of Earth's

Tilt

400

The largest planet in our solar system

Jupiter

400

Another name for a shooting star

Meteor

400

A region between the orbits of Mars and Jupiter 

Asteroid Belt

500

The Milky Way, a star system in the universe, is 

A Galaxy

500

The Sun holds Earth in orbit because of

Gravity and Inertia

500

Names of the four inner planets

Mercury, Venus, Earth, and Mars

500

"Dirty snowballs" or mixtures of ice, rocks, and dust left over 

Comets

500

The different amounts of lightened parts of the Moon

Phases