Saturn's
largest moon already provides necessities such as a thick atmosphere.
Not exact matches
If these giant
moons around giant planets exist, they might
already be present in the available data of NASA's Kepler space telescope, or they could be detectable with the European Space Agency's upcoming PLATO space mission and European Southern Observatory's ground - based European Extremely
Large Telescope.
We
already knew that Saturn's biggest and brightest ring, the B ring, is kept in check by gravitational nudges from the
large moon Mimas.
Pluto and its
largest moon Charon are
already tidally locked, as well as many small
moons of the giant planets in Earth's solar system.