Moon rock 2

Here's the progress on my moon embroidery. I've just about finished the purple area, although I might scatter a few more purple knots around the edges. I've only got one two-strand length of variegated purple thread left for a bit of extra shading, so that was good planning (or luck)!
Topographically, I think this purple patch must be the remnant of a fairly large crater (I read it as lower than the surrounding areas) with lots of smaller, more recent craters scattered over it. The large purple crater at the top right of this area is the Apollo crater, commemorating the historic missions to the moon. The purple oval at the lower left is called Schrodinger -- I don't know where his cat is and whether it is alive or dead -- and the pale blue oval just above it is the Planck crater, which is, however, not 0.0000000000000000000000000000000000016 metres long.