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"These metamorphosed sedimentary rocks that have melted and produced granites that concentrate uranium and thorium are like black box flight recorders that record pressure and temperature," Smye said.

Previous studies had found that smooth muscle cells metamorphose into different types of cells inside these atherosclerotic plaques and multiply to make up most cells within the plaques.

"In the last 30 years my ideas around loss have been in a continuous state of metamorphosing," she writes.

On Earth, there’s an efficient way “to get those rocks up to the surface and cycle surface rocks down to be metamorphosed,” McSween says.

They pulsate, drip, twist, ooze, squirm and sometimes even metamorphose, and when they were displayed alongside the menacing work of the “Alien” artist H.R.