Nobody had ever thought of this roughly 300 - mile - wide
icy satellite as anything special — until the Cassini spacecraft witnessed geysers of water vapor blowing out from its surface.
Not exact matches
But another of Jupiter's
satellites,
icy Europa, is a contender,
as are Enceladus and the largest of Saturn's moons, Titan.
That means that the small
satellites should still be pretty
icy — a prediction that may be tested
as soon
as 2015, when NASA's New Horizons probe reaches the area.
The interiors of the
icy satellites of giant planets, such
as in Jupiter's moon Europa, have conditions where carbonic acid could form.
These forces occur on Earth in glacial ice
as it flows due to gravity, and in space
as icy satellite bodies, such
as the moons of Jupiter and Saturn, respond to tidal forces from their parent bodies.
Ice shells of
icy satellites can have warm interiors — approximately 0 degrees C — but surface temperatures
as low
as -200 degrees C -LRB--330 F), like on Saturn's moon Enceladus, though the team's apparatus does not reach that extremely low temperature.
As a researcher at Brown University in the late 1990s, Pappalardo worked on the Galileo mission when the first detailed pictures of the planet's
icy satellites were beamed back to Earth.
Its H2O ice — rich surface is unlike other outer solar system
icy satellites in exhibiting distinctly reddish tholin coloration around its northern pole
as well
as a few highly localized patches rich in NH3 ice.
The large
satellites of Uranus show unique geologic features we'd like to understand (such
as the tortured - looking surface of Miranda, a small moon with the tallest cliff in the Solar System), while Neptune's
satellite Triton is thought to be a captured Kuiper Belt object, similar to Pluto, potentially harboring an ocean under its
icy surface.
Low scattered - light capability with coronagraphy and high - resolution spectroscopy enables to visualize neutral atmosphere and plasmas escaping from
icy satellites of Jupiter and Saturn
as well
as Io that has active volcanoes.