The infamous Halley's Comet only comes around once every 75 years or so! Read some interesting info on the world's most famous comet.

What is water energy? Also known as hydro power, water energy is one of our important renewable resources!

Don't let your kid bark up the wrong tree! Engage him in a word search filled with tree terms, boosting his attention to detail and problem solving skills.

It's easy being green when you have our Earth Day game for a guide. Just print out this Earth Day game and get ready to score one for the planet.

This Earth Day quiz family and friends with this true or false questionnaire. It's all in good, informative, fun!

Here's an introduction to different types of rocks.

Learn all about rivers--how they were formed, what they're made of, and what they do for us and the planet--in this reading and science worksheet.

Looking for a fourth grade worksheet to help your kid with astronomy? This printable will help him learn the relative sizes of planets.

What is biomass energy? Learn about an important form of renewable energy with this colorful worksheet.

What is Pluto? According to scientists... no, not quite. Find out more behind the answer to that age-old question.

This printable features the planet closest to the sun. Learn Mercury facts and further your knowledge of outer space by discovering new things.

This worksheet features a scientific explanation and awesome photos of solar eclipses, which are extremely rare scientific phenomena.

Use this cool 2-page worksheet to make your own big dipper clock!

Does your child have a knack for astronomy? Teach him about the constellations with this great worksheet.

Many legends told by ancient people have characters that you can find as star formations called constellations! This one is Andromeda.

Space enthusiasts will love learning about Freedom 7, the first manned American space mission.

Blast off into space with a fun planet printable. This one features Jupiter, the largest planet in our solar system.

Explore one of the great mysteries of the universe with this space science worksheet on black holes.

What does the Earth look like? Find out all about the nooks and crannies that cover the planet with this landforms worksheet.

This word search introduces your child to important rocks and minerals vocabulary, as it strengthens his attention to detail.

Educate your budding scientist about fossil fuels with this worksheet about non-renewable energy.

On this worksheet, kids learn all about the look and location of Uranus, and they get to cut out a picture to use in their own Solar System diagram.

Learn what distinguishes a meteoroid, meteor and meteorite with this outer space science sheet!

Learn how sand dunes form, and a little bit about desert formations like yardangs as well, in this science summary sheet.

Teach your child about the layout of the Solar System with this simple worksheet, featuring the planet Neptune.

Our solar system has hundreds of moons! Read a bit about how a moon is formed with this lunar lesson.

Ready for liftoff? Take to the starry skies with this worksheet that explores the three basic types of galaxies.

Here's a quick overview of drought and flooding to spark thoughts or conversation with your kids about water.

Let your kid's knowledge of leaf vocabulary climb as high as a tall, tall tree with this fun word search.

Learn about how the Earth was formed in this science worksheet that covers the early years of the Earth.