Habitable zones

The Earth

Habitable zones

A habitable zone, sometimes called a Goldilocks zone, is the region around a star where orbiting planets similar to the Earth can support liquid water. It is neither too hot, nor too cold.

Scientists hunting for life in the Solar System and around other stars believe liquid water is an important ingredient necessary for life.

In September 2010 astronomers using the Keck telescope announced they had found an exoplanet, Gliese 581g, about three times the size of Earth in the habitable zone of its star.

Image: Astronomers look for exoplanets similar to the Earth inside their stars' habitable zones (credit: NASA)

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The Earth

Introduction

Astronomers search for other 'Earths' orbiting distant stars.

About Habitable zones

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