The walls that line human coronary arteries have been imaged for the first time in 3-D. Such images will allow cardiologists to visualize areas of inflammation and plaque deposits more clearly.
The two parts of asteroid 1999 KW4 whirl around each other while hurtling through space.The larger piece, Alpha, would break apart if it spun any faster. Credit: E.M. Jong, S. Suzuki, S.J. Ostro, D.J. Scheeres, U. of Michigan