Tiny lunar volcanoes

Bad Astronomy
By Phil Plait
Dec 12, 2011 10:19 PMNov 19, 2019 9:50 PM


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The Moon is packed with all sorts of interesting features that only come to light -- literally, in some cases -- when very high-resolution imaging is done. For example, the lunar far side has a bunch of small volcanoes, some only a few hundred meters across, like this one:

[Click to enlunenate.] The image is about 500 meters across, so this is a hill you could climb pretty easily, even though the low Sun angle implies the slope is greater than 13° (remember, the Moon has 1/6th the Earth's gravity so that would be a pretty easy hike). Those boulders on the top are weird; they only appear to be on one side, and there doesn't seem to be anything in that direction that would be a source of them. There are none on the plains around it, or at the bottom of a nearby crater, either. The source must be the volcano itself, I'd wager. Note the crater at the top of the mound, too - you might think that's the volcanic vent, but in fact it's not centered on the dome, indicating it's a coincidental impact crater. Because the Sun is coming from the side, some people might have a hard time seeing this as a dome. It's a well-known illusion I've pointed out on this blog many times, but maybe this red/green 3D anaglyph by Nathanial Burton-Bradford will set you straight:

That one's really cool; the opposite relief of the crater and volcano makes this one really fun to look at. The Moon's ancient volcanism is a pretty ripe field for study, since not a whole lot is known about it (gamma-ray mapping of this area shows it's rich in the radioactive element thorium, for example -- how about that?). I wonder if 3D images like the one above would help scientists understand this better? Image credit: NASA/GSFC/Arizona State University

Related posts: - Ash hole on the Moon - A lunar illusion you'll flip over - Raising an impact in Africa - Terra spots an impact on, um, Terra

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