Summary
The plasma science instrument measures the amount of plasma (electrically charged atoms) and the direction it is flowing. No other human-made spacecraft has collected such data in interstellar space.
On Sept. 26, engineers issued the command to turn off the plasma science instrument. The team has confirmed that the switch-off command was executed without incident.
The Voyager 1 and 2 Voyager spacecraft were both launched in 1977. The Voyager 1 was the first to orbit the sun and the Voyager 2 was the second.
