EXPLORE EARTH

A Timeline of Early Hominids

Since about 4 million years ago, humans have evolved from early hominids to modern humans. Here are 14 species examples from human evolution now extinct.

Human Evolution

100 Facts About Earth

Earth needs no introduction. From its origin to its inevitable future, the story of Earth is greatest story ever told. Get started with this list of 100 Earth facts.

Earth Exploration

The History of the Universe

What's the history of the universe? Follow us on a journey that starts with the Big Bang. All the way to the formation of stars, galaxies and eventually us.

Big Bang
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Atmosphere

Career

Geology

Life Science

Outer Space

Water Science

Our solar system is a 4.57 billion years old planetary system that includes a central star and all the natural space objects (planets) orbiting the Sun.

Solar System
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Recently Updated

Aurora Borealis

Aurora Borealis Facts: How the Northern Lights Work

During magnetic storms, trapped plasma flashes lights that are observable around the globe. This disturbance in the magnetosphere is the Aurora Borealis.

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Solar System Infographic

A Visual Guide to Our Solar System [Infographic]

Our solar system is a 4.57 billion years old planetary system that includes a central star and all the natural space objects (planets) orbiting the Sun.

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Human Timeline

Human Timeline: How Long Have Humans Existed?

The earliest anatomically modern human fossil found was dated at about 200-300,000 years old in Morocco, Africa. They had modern faces and used stone tools.

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Pangea Periods

What Is Pangaea? Piecing Together the Supercontinent Jigsaw Puzzle

About 200 million years ago, all the continents were together as one giant supercontinent known as Pangaea. Over time, these continents have broken apart.

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Age of Dinosaurs

The Dinosaur Era: When Dinosaurs Dominated

If you rewind the clock 230 million years back, dinosaurs dominated the land. Not just for a short span of time. But they lived for over 175 million years!

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States of Water

States of Water: Gas, Liquid and Solid

Because water is extremely versatile, it changes phases rapidly. The states of water are gas, liquid and solid. Water cycles through these phases in nature.

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