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The 'habitable zone' around the Sun is the region where
Earth's average surface temperature today is about 15 °C. Without the natural greenhouse effect, it would be about
So far, Earth is the only planet in our Solar System known to support life.
Earth is about 150 million km from the Sun. Mars is about 1.52 times as far from the Sun as Earth. How far is Mars from the Sun (in million km)?
Describe four conditions that make Earth suitable for life.
The figure shows four planets W, X, Y and Z (drawn to scale) and the habitable zone around the Sun in a simple model. (a) Which planet lies inside the habitable zone? (b) What would happen to surface water on planet W and on planet Z? (c) Why is it important that the habitable zone is neither too close nor too far from the Sun?
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