SciShow space: secret space plane and Curiosity’s curiosity

X-37b is a space plane that flies since 2012, for 500 days in a row now, at about 175 km altitude. Nobody knows for sure what it does up there as it has no crew inside, but it is believed that it is used as a test bed for future reusable space shuttles. YAY.

On Curiosity news side, it has taken a new sample of dirt from Mars and it is trying, yet again, to see how Martian sand deposits turn into sandstone so that they can better understand how water helped the formation of other rocks. In any case, Curiosity is on its way to Mount Sharp and it has rolled about 4 kilometers since it landed in there.

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