View Photo Gallery: NASA’s Curiosity rover is rolling about deep in a Martian crater after a picture-perfect descent and landing, beginning what promises to be one of the most ambitious planetary missions in history.

The Mars rover Curiosity has completed its first Foursquare check-in, letting everyone know that, yes, it is still on Mars.

The rover is not the first check-in beyond planet Earth. Expedition 25 Commander Douglas Wheelock holds that distinction, checking in from the international space station and unlocking the NASA Explorer Badge, which those of us here on Earth can get by visiting space-related locales. Wheelock’s check-in took place in October 2010. So, Curiosity’s a little late to the outside-of-Earth check-in race. But it is, indeed, the first check-in from another planet.

One check-in closer to being Mayor of Mars!(@ Gale Crater) [pic]:

— Curiosity Rover (@MarsCuriosity) October 3, 2012

It’s definitely up there for one of the best marketing opportunities Foursquare could ask for, with the company even going so far as to invoke Carl Sagan:

Today, NASA’s Curiosity Mars Rover checked in for the first time on Mars, marking the first Foursquare check-in ever on another planet (and the second check-in in space!). Carl Sagan would be proud.

Track NASA and Mars Curiosity on Foursquare. Oh, and good luck resisting the urge to click the “been there” button on Gale Crater.

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