A peek at a pitch-black pit

March 20, 2012 by Jason Major, Universe Today
A dark, rimless pit crater within the crater Tolstoj on Mercury. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

MESSENGER captured this high-resolution image of an elongated pit crater within the floor of the 355-km (220-mile) -wide crater Tolstoj on Mercury on Jan. 11, 2012. The low angle of sun illumination puts the interior of the pit crater into deep shadow, making it appear bottomless.

Pit craters are not caused by impacts, but rather by the of the roof of an underground magma chamber. They are characterized by the lack of a rim or surrounding ejecta blankets, and are often not circular in shape.

Since the floor of Tolstoj crater is thought to have once been flooded by , a pit crater is not out of place here.

The presence of such craters on Mercury indicates past on Mercury contributing to the planet’s evolution.

Read more on the MESSENGER mission website here.

Explore further: Distal Rampart of Crater in Chryse Planitia

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not rated yet Mar 20, 2012
Have they/will they open(ed) the f-stop and/or increased the exposure to bring out any detail in the shadow?

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