Curious Kids: what is the coldest planet in the Solar System?

By Brad Gibson, Director of the E.A. Milne Centre for Astrophysics and Head of the Department of Physics and Mathematics, University of Hull

What is the coldest planet in the Solar System? – Sejal, aged seven, Bangalore, India

The planets in our Solar System are heated by the Sun. Here on Earth, we are about 100 million miles away from the Sun – a distance that provides the perfect temperature for life.

You might think, then, that the coldest planet in the Solar System would be Neptune, as it is the furthest away from the Sun’s warmth. Neptune is an incredible three billion miles away from the Sun.

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