Mars Rover Finds Unusual Rocks at 'Home Plate'
An anonymous reader writes "After several months of driving nearly a kilometer, the Mars Rover Spirit has reached the semicircular plateau dubbed 'Home Plate' in Gusev Crater and has unearthed a puzzle. Spirit first got a good view of Home Plate in late August from 'Husband Hill'. The layered appearance is unlike anything yet seen by the rovers."
I'm no oncologist, but that little squishy thing I just sneezed out of my nose looks like a dislodged brain tumor.
Can any resident Slashdot oncologists solve this mystery?