That’s the Red Orbit’s Mars picture of the day (or something). I’ve always loved astronomy, precisely for delights like this.
Ancient Caldera
Credit: ESA/DLR/FU Berlin (G. Neukum)
This image, taken by the High Resolution Stereo Camera (HRSC)
on board ESA’s Mars Express spacecraft, shows the caldera of
Apollinaris Patera, an ancient, 5-kilometre-high volcano northwest of
Gusev Crater.
The HRSC obtained this image during orbit 987 with a ground
resolution of approximately 11.1 metres per pixel. It shows part of
Apollinaris Patera, a volcano lying at approximately 7.2° South and
174.6° East.
Apollinaris Patera is an ancient shield volcano located at the
northern edge of the Southern Highlands, lying to the south-east of
Elysium Planitia and to the north of Gusev Crater, which is now being
explored by NASA’s Mars Rover, Spirit.
The volcano measures approximately 180 by 280 kilometres at its base
and rises to a maximum of 5 kilometres above the surrounding terrain.
Shield volcanos are large volcanic structures with gently sloping
flanks. The caldera of Apollinaris Patera takes the form of a large
crater approximately 80 kilometres in diameter and up to 1 kilometre
deep. Volcanic calderas are formed when a volcano explodes or when the
cone collapses.
This false-color image was captured on 26 October 2004 by the
High-Resolution Stereo Camera (HRSC) onboard the ESA spacecraft Mars
Express with a ground resolution of approximately 11.1 metres per
pixel.
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