Putting a spacecraft back in the orbit it was intended, thirty-one years later.

Putting a spacecraft back in the orbit it was intended, thirty-one years later.

The spacecraft, ISEE-3, was intended to study the solar wind and the connection between the Sun and the Earth. In 1986 it was diverted instead to take a look at Halley’s Comet. Now there is an opportunity to return it to its original task, assuming engineers can wake it up after three decades.