Although there is much to learn about our own solar system, it seems there's more to discover outside of it. Exoplanets are the planets outside of our solar system, and they come in all different shapes, sizes, orbits and densities. Over 5000 of them have already been discovered, but experts hypothesise that there may be billions in total, many of which may be habitable should we ever need an Earth 2.0. Join professor of astronomy and mathematics Richard Nelson who explores these phenomena.
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