NEW YORK (AP) 鈥� NASA is two science instruments on its long-running twin Voyager spacecraft to save power.
The space agency said Wednesday an instrument on that measures charged particles and cosmic rays will shut off later this month. Last week, NASA powered down an instrument on designed to study cosmic rays.
The energy-saving moves were necessary to extend their missions, Voyager project manager Suzanne Dodd at the NASA Jet Propulsion Laboratory said in a statement.
The twin spacecraft launched in 1977 and are currently in interstellar space, or the space between stars. Voyager 1 discovered a thin ring around Jupiter and several of Saturn鈥檚 moons, and Voyager 2 is the only spacecraft to visit Uranus and Neptune.
Each spacecraft still has three instruments apiece to study the sun's protective bubble and the swath of space beyond.
Voyager 1 is over 15 billion miles (24.14 billion kilometers) from Earth and Voyager 2 is over 13 billion miles (20.92 billion kilometers) away.
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Adithi Ramakrishnan, The Associated Press
