Recent flybys of the fiery world refute a leading theory of its inner structure—and reveal how little is understood about ...

Each of Jupiter's other 91 official moons has a diameter greater than 0.6 mile (1 kilometer) — but only 57 have names, and just eight have regular, nearly round orbits.

And half of the 50 years, NASA Voyager 1 has spent billions of miles traveling into interstellar space. In October, it went ...

But the moon’s wild volcanic activity wasn’t detected until Voyager 1 flew by Jupiter and its moons in 1979, revealing Io’s ...

Voyager 2 entered Jupiter's orbit as Voyager 1 was on its way out and took an additional 14,000 photos before completing its Jupiter encounter in August 1979. That was 45 years ago.

But the moon’s wild volcanic activity wasn’t detected until Voyager 1 flew by Jupiter and its moons in 1979, revealing Io’s dynamic surface that resembled a pepperoni pizza, Bolton said.

From Jupiter’s cratered Callisto and volcanic Io to Saturn’s cloudy Titan to plumes erupting on Triton, a moon of Neptune. The Jupiter and Saturn systems have since been explored in greater detail by ...

Each of Jupiter's other 91 official moons has a diameter greater than 0.6 mile (1 kilometer) — but only 57 have names, and just eight have regular, nearly round orbits.

There are jets in Jupiter’s magnetosheath, according to Voyager 2 mission data from 1979. The 45-year-old information is now revealing the dynamics of the plasma stream.

S cott Bolton’s first encounter with Io took place in the summer of 1980, right after he graduated from college and started a job at NASA. The Voyager 1 spacecraft had flown past this moon of Jupiter, ...

But the moon’s wild volcanic activity wasn’t detected until Voyager 1 flew by Jupiter and its moons in 1979, revealing Io’s dynamic surface that resembled a pepperoni pizza, Bolton said.