Something has exploded on the farside of the sun. Late yesterday, Dec. 4th,
a billion-ton coronal mass ejection (CME) billowed over the sun's western limb.
There are two farside active regions currently under surveillance by NASA's STEREO spacecraft,
but those active regions don't seem to be in the right place to hurl a CME over the sun's
western limb. The source might reveal itself in the days ahead as the sun's rotation turns
unseen territory toward STEREO--or toward Earth.
Stay tuned.
