Nasa does a lot of cool stuff. Landing on the Moon? Going to Mars? That whole secret space station thing? All very neat.
But among all those incredible feats is another excellent tradition - making really great patches for all of their missions.
And occasionally putting a cartoon character on them.
Nasa has helpfully collected some of its patches here - but there are a lot of them (since there have been a lot of missions) and the good stuff can be hard to find.
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To make it easier we've pulled together some of Nasa's best-ever patches, below.