Lee
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leesaper.bsky.social
Lee
@leesaper.bsky.social
Experimental petrology | planetary science
Postdoctoral fellow at NASA JPL
Reposted by Lee
A fantastic view from the Mars Curiosity Rover using ChemCam looking towards the distant Yardang Unit. Taken this week on Sol 4562.

flic.kr/p/2r9tnDZ
June 7, 2025 at 5:59 PM
Reposted by Lee
The surface of Saturn’s moon Iapetus in the dark region “Cassini Regio” taken in September 2007 when Cassini passed to within 1,227 km. This dark blanket is only about a foot thick on average and reveals bright patches of ice when impacted.
December 18, 2024 at 12:37 AM
Google should do a yearly “wrapped”… a guess at mine:

1. gas constant
2. gas constant “J/mol K”
3. Molar mass P2O5
4. How to disable AI in [insert any software or app]
5. How to enable macros in Excel
December 5, 2024 at 6:51 PM
Reposted by Lee
Here's a (probably) long and (certainly) intermittent thread covering the #geoscience research that's been done at Edinburgh Geosciences using X-ray #Microtomography to study Earth materials and processes. I'll post links to open source papers, but first a bit of background ...
November 10, 2024 at 7:47 PM
Just submitted a manuscript for a project that has been almost 5 years in the making, and probably the work I’m most proud of to date… The best news is that I don’t need to look at it for a while
November 6, 2023 at 4:24 AM
Reposted by Lee
Last JWST moon of Saturn for a while: Mimas! aka the Deathstar. Turns out that Mimas looks an awful lot like it you took an ice cube, ground it up into 300 micron particles, and stuck it in your spectrometer. Also an oh-so-tiny trace of CO2 there marked in red. But otherwise: this is ice. 🔭🧪
October 31, 2023 at 10:42 PM
Reposted by Lee
Images of Io from the Juno flyby last weekend plus a map of Io’s north polar region.
October 21, 2023 at 1:48 AM
Reposted by Lee
In a vault behind glass, there is stored a C program from 1978:

#include <stdio.h>

main()
{
printf("goodbye, world\n");
}

When the time is right, we are to break the glass and run the program. It is to be the last C program.
October 9, 2023 at 3:46 AM
Contemplating adding a list of memorised alt codes to my CV
October 10, 2023 at 10:33 PM
Oblique views of Hjørundfjorden, and Nordfjord with Jostedalsbreen and Ålfotbreen glaciers leaving Ålesund, Norway. Stunning geology both at ground level and from above!
September 20, 2023 at 1:45 PM
Cool cobble
September 19, 2023 at 11:31 AM
Briksdalsbreen glacier. Terminus was at lake level in 2007 😐🫠
September 14, 2023 at 6:48 PM
Grateful to have one more rare glorious day in Scotland before leaving
September 4, 2023 at 8:11 PM
Having been thinking a lot about cooling basalt, this is what I imagine the inside of my brain is looking like these days #staffa
September 1, 2023 at 2:06 PM