• The inner planets are: Mercury, Venus, Earth, and Mars. They are relatively small, composed mostly of rock, and have few or no moons.
• The outer planets include: Jupiter, Saturn, Uranus, and Neptune. They are mostly huge, mostly gaseous, ringed, and have many moons (plus Pluto, which is a dwarf planet that has one large moon and two small moons).

• Asteroids (also called minor planets) are rocky or metallic objects, most of which orbit the Sun in the asteroid belt between Mars and Jupiter.
• Comets are small, icy bodies that orbit the sun. They have very long tails.
• Meteoroids are small bodies that travel through space. They are stony and/or metallic and are smaller than asteroids. Most are very tiny.

The Solar System Book A simple printable coloring book about the Solar System to print (for early readers). Pages on the Solar System, the Sun, Mercury, Venus, the Earth, Mars, Jupiter, Saturn, Uranus, Neptune, plus Pluto, the dwarf planet.

Astronomy: K-3 Theme Page Activities, quizzes, books to print, and printouts.

Celsius Bar Graph Questions #2: Printable Worksheet A printable activity worksheet in which the student reads a bar graph of the average temperatures of the planets to answer questions, for example, "On average, is it warmer on Jupiter or Mars?" Or go to the answers. Go to a pdf version of the worksheet.

An interactive puzzle on the Solar System.

Solar System Tutorial
- an on-line teaching/quiz about our Solar System.

Find It!, a quiz about the solar system.

A fill-in-the-blank (cloze) activity on the Solar System - or go to the answers.

A Solar System calendar to print out and color.

A Solar System Model to make

Solar System Crafts

How to write a report on a planet - plus a rubric.