Voyager II

Another man-made object reaches the edges of the Solar System. From CNN:

Voyager II could pass beyond the outermost layer of our solar system, called the "termination shock," sometime within the next year, NASA scientists announced at a media teleconference Tuesday.

The milestone, which comes about a year after Voyager 1's crossing, comes earlier than expected and suggests to scientists that the edge of the shock is about one billion miles closer to the sun in the southern region of the solar system than in the north.

Barring any unforeseen hardware failure, Voyager I and II should have enough power and communications capability to keep radioing back to Earth until 2020.

Fascinating.