the best science on the web about
Earth

Earth: Overview
Image: NASA

Earth: Overview

What should you know about the ground beneath your feet? Well, for starters, Earth is the only planet in our solar system not named after a Greek or Roman god. The word actually means "ground."

Investigate the third planet from the sun with this in-depth look at Earth's size, surface, atmosphere, and orbit — and the space missions that have shaped our understanding of home.

NASA
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Space School: Earth

Space School: Earth

Why is Earth home to millions of species of animals and plants when the other planets in our solar system seem lifeless? Take a look at our complex, fragile, and unique planet. More...

Video
Science Channel
‘8 Planets and a Dwarf’ Sudoku

‘8 Planets and a Dwarf’ Sudoku

Love puzzles? This online Sudoku-like puzzle involves all the planets of the solar system, plus Pluto. Featuring 5 levels, you can start with “very easy” and work your way up to “extra challenging.” More...

Game
Windows to the Universe
4 Ways to Understand the Earth’s Age

4 Ways to Understand the Earth’s Age

Consider Earth's history as a single calendar year — dinosaurs don't even appear until December! Take a look at this and three other ways to understand the mind-bending span of 4.5+ billion years. More...

Video
TED-Ed/Josh Sneideman
Dynamic Earth: Earth’s Structure

Dynamic Earth: Earth’s Structure

Quake-generated seismic waves provided geologists a wealth of knowledge about Earth’s internal workings. Delve into a cross-section of Earth for details about its insides.
More...

Interactive
Annenberg Learner
A Guide to the Energy of the Earth

A Guide to the Energy of the Earth

Examine the many ways energy cycles through our planet and its systems — from the Sun to our food chain to electricity and beyond. More...

Video
TED-Ed/Joshua M. Sneideman
Missions to Planet Earth!

Missions to Planet Earth!

Earth needs your help — now! Play these card games that also explain how satellites help tell us what's happening on our own planet. More...

Game
NASA
Why Does the Earth Spin?

Why Does the Earth Spin?

You won't believe the ideas people have about motion. It appears from this video that few of us know why the Earth, after billions of years, keeps spinning round. More...

Video
Veritasium
10 Views of Earth from the Moon, Mars, and Beyond

10 Views of Earth from the Moon, Mars, and Beyond

Check out these stunning images of our planet, which include the first Earthrise photo (taken during 1969's Apollo 11 mission) and a shot from India's first moon mission in 2008. More...

Images
Scientific American
A Day on Earth

A Day on Earth

Why does a day on Earth last 24 hours while Saturn's day clocks in at 10.2 hours? And what causes Earth's seasons? Zoe explains it all, but you're on your own for the quiz. More...

Interactive
Scholastic
Earth Observatory: Images

Earth Observatory: Images

Browse these NASA galleries of stunning Earth images — natural hazards, life, snow and ice, heat, remote sensing, and more. More...

Images
NASA
The Big Blue Marble

The Big Blue Marble

How does Earth — the only planet in our solar system known to host life — measure up to its neighbors? Take a closer look at Earth's stats and size with this interactive. More...

Interactive
National Geographic
The Earth’s Birth

The Earth’s Birth

Travel back billions of years to see how Earth got its start as a few pieces of rock colliding as they circled the sun ... and then developed its inner heat during the Hadean eon. More...

Video
BBC

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