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A mathematician and engineer, he calculated the Earth's age to fall between 20 million and 400 million years based on how long it would have taken a homogenous planet to cool from a fully molten ...

Narrated by Stephen Fry. Unfortunately A Year on Planet Earth isn't available to watch right now. Add it to your list and we'll let you know when it becomes available.

Ecosystems support all life on Earth. The healthier our ecosystems are, the healthier the planet - and its people ... scientists emphasize that these next ten years are pivotal in combating ...

Yet despite the drumbeat of evidence, we still know of just one planet in the cosmos with life — the one you’re standing on.