Ejecta Blocking Boulders

All credit for this entry goes to forum regular kodemunkey who wrote this article:

Hello, and welcome to what will hopefully be the first of many IOTW posts from me.

I was exploring the LRO Data using the WMS Browser and I came across Maginus crater.

(Maginus crater, as seen in the WMS browser, latitude -48.992774 longitude -5.149416)

This is what Wikipedia has to say about the crater:


Maginus is an ancient lunar impact crater located in the southern highlands to the southeast of the prominent crater Tycho. It is a large formation almost three quarters the diameter of Clavius, which lies to the southwest. Just to the north of Maginus is the smaller crater Proctor, and to the southeast is Deluc.

The rim of Maginus is heavily eroded, with impact-formed incisions, and multiple overlapping craters across the eastern side. The wall is broken through in the southeast by Maginus C, a worn crater. Little remains of the original features that formed the rim of Maginus, and it no longer possesses an outer rampart. The floor is relatively flat, with a pair of low central peaks.

The thing about Maginus that interested me at the time was the unnamed crater near Maginus A, as it has a lot of NAC frame coverage. I’m certain that like me you prefer to look at areas with a lot of coverage, if only out of sheer nosiness!

The thing that first caught my eye about the crater was this large, and probably quite deep crack:

The next thing to catch my eye are these huge boulders which are blocking the flow of material down the slope.

These things are quite large, probably at least the size of a house, I wonder where they came from?

Sources and more information:


NAC frame: http://wms.lroc.asu.edu/lroc/view_lroc/LRO-L-LROC-2-EDR-V1.0/M175308014LE

Your task, should you choose to accept it (even if you don’t ) is to try and figure out how the boulders came to be in their present positions.

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About juleswilkinson

Citizen scientist and volunteer. Forum moderator for the Milky Way Project, Solar Stormwatch, Science Gossip and Shakespeare's World. Owner of 3 telescopes, a dog and a meteorite.

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