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Adrastea (/ æ d r ə ˈ s t iː ə /), also known as Jupiter XV, is the second by distance, and the smallest of the four inner moons of Jupiter.It was discovered in photographs taken by Voyager 2 in 1979, making it the first natural satellite to be discovered from images taken by an interplanetary spacecraft, rather than through a telescope. [6]
The high-resolution photos from Voyager 2, taken closer to Jupiter, left scientists puzzled as the features in these photos were almost entirely lacking in topographic relief. This led many to suggest that these cracks might be similar to ice floes on Earth, and that Europa might have a liquid water interior. [30]
Voyager 2 returned images of Jupiter, as well as its moons Amalthea, Io, Callisto, Ganymede, and Europa. [3] During a 10-hour "volcano watch", it confirmed Voyager 1 ' s observations of active volcanism on the moon Io, and revealed how the moon's surface had changed in the four months since the previous visit. [3]
Flybys of Jupiter’s moon Io, the only known volcanic world in our solar system, have captured images of a massive lava lake and a towering Matterhorn-like mountain.
In the hours prior to Voyager 1's encounter with Io, the spacecraft acquired images for a global map with a resolution of at least 20 km (12 mi) per pixel over the satellite's leading hemisphere (the side that faces the moon's direction of motion around Jupiter) down to less than 1 km (0.6 mi) per pixel over portions of the sub-Jovian ...
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.
In August 1989, Voyager performed its last flyby, going by Neptune and visiting its moon Triton. The gravity assist carried Voyager 2 below the ecliptic plane. In March 1979, Voyager 1 made its close approach to Jupiter, capturing detailed images of the planet and its moons, with Voyager 2 conducting its flyby four months later.
The moon is frigid. When Voyager 2 zipped past Neptune and Triton, it took surface-temperature readings, which revealed that the moon’s surface could drop to around -391 degrees Fahrenheit ...