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NASA's OSIRIS-REx

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The wrecked Imperial Star Destroyer (right-down quadrant, exactly above the dark square shadow).

Spoiler

20190702-Smooth-Boulders.png

 

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It's interesting because we've all seen rocks with cracks and all kinds of textures, but the things that made these rocks look the way they do are completely different than how it happens on Earth. For instance, lots of these rocks have long, straight cracks! What's up with that? Did little meteor impacts chisel out big shards of rock? Or is it something else? 

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On 8/28/2019 at 4:57 PM, cubinator said:

It's interesting because we've all seen rocks with cracks and all kinds of textures, but the things that made these rocks look the way they do are completely different than how it happens on Earth. For instance, lots of these rocks have long, straight cracks! What's up with that? Did little meteor impacts chisel out big shards of rock? Or is it something else? 

Earth rocks also can show linear cracks, but often with very different types or rocks than Bennu http://maps.unomaha.edu/maher/STEP07/supportinfo/cracks.html  There are phyllosilicates (clays) on the surface, they could exhibit a preferred fracture orientation.  It may be due to thermal fracturing, and perhaps related to the particle ejection events.  So much science to do.

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What a bizarrely wonderful little world...

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I haven't looked at this mission in several months.  Now I see Bennu is so covered with boulders they've had trouble finding any places to "land" at all, and have had to rewrite the landing program to come down between all the boulders.  I'm glad they think they can make it work despite all the boulders.

It's too bad they can't just turn down their scatter setting :) 

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Wow.

 

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Two of the four possible sample sites from here:

Quote

This is the highest-resolution image of candidate sample site Sandpiper that has been captured to date. Located in asteroid Bennu’s southern hemisphere, Sandpiper is visible in the center of the image (situated above the large boulder). The image was taken on October 5, from a distance of 0.6 miles (1 km). For scale, the large, light colored boulder in the bottom center of the image is 16 ft (5 m) wide, which is about the size of a box truck.

20191005-ReconASandpiper.png

Sandpiper with 16ft box truck units for scale-ish:

1IGpQHn.png

 

 

 

 

Quote

This is the highest-resolution image captured of candidate sample site Osprey as of October 12. Site Osprey is located just north of asteroid Bennu’s equator. Because the crater is so large, only a portion of it is shown in this image. Osprey’s recognizable features include a dark patch of material in the center of the crater, and a large, flat boulder on the northern crater wall (upper left). The image was taken on October 12, from a distance of 0.6 miles (1 km). For reference, the fracture in the large boulder (upper left) is 10 ft (3 m) long, which is about the length of a standing grizzly bear.

20191012ReconAOsprey.png

Osprey with grizzly bear units for scale-ish:

vKkahaR.png

Edited by SuperFastJellyfish
Added scale imagery

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If you said that this image was the 1:1 with what I see on my monitor at full size---that the frame is 24cm across, in other words---I'd think, "that seems about right." Instead the frame is what, ~17m across? Amazing how there is no sense of scale at all. I'd bet that zoomed in it looks the same.

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4 minutes ago, tater said:

Amazing how there is no sense of scale at all. I'd bet that zoomed in it looks the same

Fractal-roids?

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