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LROC news and images
Gerald
post Feb 23 2017, 07:24 PM
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I'm assuming the slabs composed of (bulk) basalt, and the surface layers consisting of (finer grained) regolith. The regolith should erode much faster than basalt.
Therefore, I've assumed the slabs being ejected fragments of a basalt layer beneath the surface regolith.
The slabs cannot be very young, since they are partially covered with cratered regolith, and there is no obvious sign of the slabs having impacted recently. Therefore they should be considerably harder (resistant to erosion) than the other material around.

Just one scenario.
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wildespace
post May 1 2017, 09:20 AM
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QUOTE (James Fincannon @ May 8 2012, 03:20 PM) *
Thanks, Phil.

Yes, I, of course, noticed those frames too during my work on this. My original assessment was that more work was needed (since it was not so clear cut as the three I was sure about) and I couldn't understand the shadows being shown without more modeling/analysis. Eric Jones and I went back and forth about this a lot. If someone in the audience wants to offer a model (i.e. 3D) for the shadow casting for these frames, then we would welcome it. It is baffling. You idea might work but I have not had the time to test it and other theories.


I can see the Apollo 15 flag's shadow clearly.

Attached Image


Basically, if you see a small shadow that, with the changing of the sun angle, seems to travel being detached from the ground, that's a flag's shadow, due to the flag being elevated above ground on a pole. The "Flip Book" is very helpful for noticing such things: http://lroc.sese.asu.edu/featured_sites/view_site/4

Shadows from objects lying directly on the ground stay attached to them.

Taking note of this, and my similar post about Apollo 14, perhaps it's time to update the ALSJ article?


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wildespace
post May 3 2017, 08:36 AM
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QUOTE (Phil Stooke @ Feb 22 2017, 06:10 PM) *
I'm replying here to James Ficannon's post in the Apollo from LRO thread. He linked to an image of a very unusual object in images of the floor of Paracelsus C on the far side.

I've come across a thread about these objects at another forum, so I'm currently "investigating" them and trying to see how the various NAC images can help us.

M1207284757LC and M1207277724LC provide a nice stereo view of these object.

Flick-gif:
Attached Image


Red-cyan anaglyph:
Attached Image


A few NACs comprise this "Flip Book" animation arranged by the sun angle:
https://media.giphy.com/media/3og0IJ9m19EJf7rJKM/giphy.gif


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alan
post May 3 2017, 04:15 PM
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QUOTE
Check out this awesome image I took of Tycho Crater! About 100 million years ago, an impactor hit the Moon to form the 85 km wide crater.


https://twitter.com/LRO_NASA/status/859473553443495936

ETA: just noticed there is a blog post with zoomable image

http://lroc.sese.asu.edu/posts/902
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