NASA's MAVEN spacecraft recently celebrated its fourth Earth year in Mars orbit by snapping a selfie to celebrate the occasion.

The spacecraft entered orbit on 21 September 2014 to figure out what happened to Mars' atmosphere, and how that relates to the planet's transition from a warm, wet past to its inhospitable current state state.

MAVEN, which stands for Mars Atmosphere Volatile EvolutioN Mission, is not equipped with a standard visible light camera, but it has an ultraviolet spectrograph imager that is used to measure the composition of Mars' atmosphere. Mission managers were able to rotate the imager, which sits at the tip of a 1.2-meter boom, back towards the spacecraft’s body and collect 21 frames that were stitched together to create a partial selfie. Not all of the spacecraft can be seen due to the imager’s limited rotation range.