Object: Exoplanet HD 189733b
Colour: Azure blue
Zooming through interstellar space on your antimatter-powered craft, you spot what looks like a familiar blue dot. After years on the move, relief sets in, until you approach closer and notice that the dot is a deep azure, nothing like the pale blue of home. You've stumbled upon another blue planet.
It turns out this is a mistake future interstellar explorers could make: astronomers have measured the colour of an exoplanet for the first time and it is blue - though that's where its similarities with Earth end.
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