Voyager 1

Voyager 1 is a NASA robotic space probe launched in 1977 to study the outer planets. It became the first spacecraft to enter interstellar space.

Jupiter encounter (Voyager 1): Voyager 1's 1979 flyby of Jupiter, which returned detailed images and measurements of the planet and its moons. This first planetary encounter revealed active volcanoes on Io and refined views of Jupiter's atmosphere.
Radioisotope thermoelectric generator: A power system that converts heat from radioactive decay into electricity using thermoelectric materials. Voyager 1 relies on three generators to power its instruments and communications far from the Sun.
Voyager program: NASA's program of two robotic spacecraft sent to explore the outer planets and continue into deep space. Voyager 1 was one of the program's two spacecraft, built for complementary planetary tours.
Io: Jupiter's innermost large moon, a volcanically active world shaped by tidal heating. Voyager 1's images revealed active volcanic eruptions, overturning expectations of a geologically dead moon.
Voyager 1 computer anomaly: A 2023 fault in Voyager 1's flight-data system that disrupted the transmission of usable engineering data. The anomaly showed how a decades-old spacecraft can remain scientifically valuable while its systems degrade.
Saturn encounter (Voyager 1): Voyager 1's 1980 flyby of Saturn, focused on its atmosphere, rings, and moon Titan. The encounter used a close Titan flyby to redirect the spacecraft out of the ecliptic plane.
Deep Space Network: NASA's global system of large radio antennas for communicating with spacecraft beyond Earth orbit. Its antennas receive Voyager 1's extremely faint signals across interplanetary distances.
Grand Tour program: A proposed NASA mission plan to send spacecraft past the outer planets using favorable planetary alignments. The Voyager missions grew from plans to exploit the same rare alignment, though their scope was reduced.
Titan: Saturn's largest moon, with a dense nitrogen-rich atmosphere and methane-based weather. Voyager 1's close approach measured Titan's atmosphere and redirected the spacecraft away from further planetary encounters.
Voyager 1 instrument shutdowns: The planned deactivation of Voyager 1 science instruments as its diminishing electrical power is conserved. Each shutdown narrows the spacecraft's ability to monitor interstellar conditions.

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