New Photos Show Collapsed Chains of Craters on a Martian Volcano By Nancy_A
Most everyone is familiar with Olympus Mons, the largest volcano on Mars and also the largest in the Solar System. But there are several other enormous shield volcanoes on Mars. The second largest is Ascraeus Mons, and new images from ESA’s Mars Express spacecraft reveal some interesting features on the side or flank of the mountain.
The images show regions where underground lava flows emptied out of chambers or tubes, which then collapsed into chains of craters. There are also smaller snakelike channels called “sinuous rilles,” which meander in a curved path like a river. They are commonly thought to be the remains of smaller collapsed lava tubes, but scientists are still unsure how they form.
This oblique or ‘sideways’ perspective view shows the southern flanks of Ascraeus Mons, the second-tallest volcano on Mars. ESA/DLR/FU BerlinAscraeus Mons is the northernmost and tallest of three prominent volcanoes found in the Tharsis region of Mars, a volcanic plateau in Mars’ western hemisphere. Ascraeus Mons reaches a towering 18 km in height but its slopes are gentle, with an average incline of 7 degrees.
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