We all know that the Moon has different phases, but it can be hard to figure out why. Try this activity to see how the Moon's phases really work.

What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

How do the phases of the Moon and gravity cause spring tides and neap tides? Does the Sun play a role in the tides? Figure it out in this fun science project!

Explore the craters, maria, and highlands on the surface of the Moon! In this fun science project you'll create a 3-D model of the moon using paper mache.

Has your kid noticed how much bigger the moon looks when it's low in the sky? Here's an activity you can do to show them that it's just an optical illusion.

The moon doesn't produce its own light, so why can we see it shining in the sky? Learn about reflection and planetshine in this fun and easy science project!

Try this simple 2nd grade science experiment to teach your child about the principles of luminosity and light reflection.

Check out this fun science fair project idea for 1st grade: a solar eclipse model that demonstrates total, partial, and annular solar eclipses.

Recreate the fantastic phenomena of solar eclipses with your child using just a flashlight, a quarter, and her very own face!

This science fair project idea examines the distance a person travels on an average day and to relate that to an understanding of the size of the Earth.

This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!

Science fair project that determines whether mass and weight are the same or different.

How does dishwashing liquid work? Kids discover the chemical mechanism behind cleansing power in this easy science fair project idea.

Try this experiment to give your curious kid a more "solid" understanding of how temperature affects the states of matter.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

What is condensation? Little mad scientists will learn about condensation, states of matter, and air pressure by conducting this cool science experiment.

This science fair project idea's objective is to become familiar with items your family regularly throws in the trash.

Enjoy those warm spring and summer nights with your child while teaching some basic astronomy at the same time.

This science fair project idea recreates the movement of planetary bodies in order to learn why they sometimes appear to move backwards.

Here is a fun middle school science project on factors affecting solubility. Learn how dissolved solids can "crash out" to form crystals when conditions change.

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!