Explore Wonders | Find: solar system

Why Is Pluto No Longer a Planet?

Poor Pluto! Put on your space suit and join us as we examine the sad tale of this once proud and now demoted dwarf planet.

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Why Is Pluto No Longer a Planet?

What's the Biggest Thing You Can See?

Today’s Wonder of the Day is huge. We’re not kidding. It’s so big you’ll have to see it to believe it!

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What's the Biggest Thing You Can See?

Where Did Earth’s Water Come From?

WATER you doing? It’s time for a new Wonder!

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Where Did Earth’s Water Come From?

How Many Stars Are In the Universe?

You can count some things on your fingers and toes, but there aren’t enough fingers and toes on Earth to count what we’re counting in Wonderopolis today!

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How Many Stars Are In the Universe?

What Is an Almanac?

You don’t have to be a farmer to enjoy these tips and tidbits. Head to Wonderopolis to flip through the history of The Old Farmer’s Almanac!

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What Is an Almanac?

Do You Believe in UFOs?

Today’s Wonder of the Day is out of this world! Well, maybe not…

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Do You Believe in UFOs?

Do Robots Wonder?

Today’s Wonder of the Day takes a closer look at machines that sometimes act like people!

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Do Robots Wonder?

How Far Can a Paper Airplane Fly?

Spread your wings and take flight with today’s all-new Wonder of the Day!

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How Far Can a Paper Airplane Fly?

What Is Braille?

Join us in Wonderopolis today to learn how it’s possible for people all around the world to read and write without the benefit of sight!

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What Is Braille?

Do All Trains Run Aboveground?

All aboard! Today’s Wonder of the Day will take you on a ride deep, deep underground!

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Do All Trains Run Aboveground?

What Happens if You Swallow Gum?

Gulp! Today’s Wonder of the Day will really give you something to chew on.

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What Happens if You Swallow Gum?

Why Do Some Years Leap Ahead?

Today’s Wonder of the Day only comes around once every four years. Don’t miss it!

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Why Do Some Years Leap Ahead?

Who Invented the Alphabet?

Today in Wonderopolis we’ll get to know the history of the alphabet from beginning to end, A to Z!

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Who Invented the Alphabet?

How Hot Is the Sun?

We hope you’re a big fan of today’s Wonder of the Day. Try to stay cool if you can!

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How Hot Is the Sun?

Why Do Leaves Change Color in Autumn?

Today’s Wonder of the Day won’t help you turn over a new leaf, but it will take a closer look at a few old ones!

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Why Do Leaves Change Color in Autumn?

Can You Really Cook an Egg on the Sidewalk?

Don’t be a chicken! Join us in Wonderopolis today for a steaming-hot Wonder of the Day sure to crack you up!

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Can You Really Cook an Egg on the Sidewalk?

What Is a Spleen?

Many people have heard of today's Wonder of the Day... but few people know what it does!

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What Is a Spleen?

How Do Touch Screens Work?

Today’s Wonder of the Day is so close you can almost touch it!

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How Do Touch Screens Work?

Do All Plants Have Roots?

Join us in Wonderopolis today as we dig deep to get to the bottom of today's Wonder of the Day!

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Do All Plants Have Roots?

Why Was Morse Code Invented?

Join us in Wonderopolis today for a celebration of dots, dashes, dits and dahs!

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Why Was Morse Code Invented?

Explore the World of Wonders

Why Is Pluto No Longer a Planet?

What's the Biggest Thing You Can See?

Where Did Earth’s Water Come From?

How Many Stars Are In the Universe?

What Is an Almanac?

Do You Believe in UFOs?

Do Robots Wonder?

How Far Can a Paper Airplane Fly?

What Is Braille?

Do All Trains Run Aboveground?

What Happens if You Swallow Gum?

Why Do Some Years Leap Ahead?

Who Invented the Alphabet?

How Hot Is the Sun?

Why Do Leaves Change Color in Autumn?

Can You Really Cook an Egg on the Sidewalk?

What Is a Spleen?

How Do Touch Screens Work?

Do All Plants Have Roots?

Why Was Morse Code Invented?

SCIENCE 1252 Wonders

MATH 51 Wonders

SOCIAL STUDIES 643 Wonders

LANGUAGE ARTS 162 Wonders

TECHNOLOGY 292 Wonders

ARTS & CULTURE 565 Wonders

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