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Not the PF Mentor!
Very cool pic, from the Viking 2 spacecraft , of the Martian moon Phobos over the volcano, Ascraeus Mons.
http://antwrp.gsfc.nasa.gov/apod/ap031129.html
Nice visual perspective on how big this moon is, how large the shield volcano is. For comparison, many a comet is about the same size as Phobos, and the smallest moons of Uranus discovered so far are about this size too.
Very cool pic, from the Viking 2 spacecraft , of the Martian moon Phobos over the volcano, Ascraeus Mons.
http://antwrp.gsfc.nasa.gov/apod/ap031129.html
Nice visual perspective on how big this moon is, how large the shield volcano is. For comparison, many a comet is about the same size as Phobos, and the smallest moons of Uranus discovered so far are about this size too.