The mission Stardust-NExT, to study comet Tempel 1, 
made it's closest ever flyby, observing the surface of the comet in unprecidented detail.
Stardust, a "recycled" mission, took images of Tempel 1 to investigate the area hit by the impactor from the Deep Impact mission. This not only gives us new insight into the physical structure of comets, but also how they change as they orbit the Sun.
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