This evening the largest and brightest supermoon in 5 years will be in the sky, but what is that? HLN science journalist Martijn Peters explains

There is a full moon again tonight. What’s more: it is a so-called ‘supermoon’. The largest and brightest in 5 years, in fact. But what is a supermoon? Is it rare? And where and when is the best time to spot them? Our HLN science journalist Martijn Peters tells everything you need to know about this phenomenon.

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