Riley — 2020-11-21 00:54:49 UTC Dense cratering is seen in some areas, but so are tectonic features including scarps and troughs as long as about 370 miles (600 kilometers). It has no water to speak of, unlike the other, colder Galilean moons.
pamelagibbsKdUh1 — 2021-03-21 00:14:08 UTC Later missions, however, showed that Mars is a complex planet and holds many mysteries yet to be solved.
qberger — 2021-04-18 16:39:59 UTC {'id': 'rpGTO3', 'type': 'p', 'text': 'They have been referred to as "dirty snowballs".'}
wood — 2021-06-18 20:56:04 UTC {'id': 'LrscKn', 'type': 'p', 'text': 'Saturn was the most distant of the five planets known to the ancients.'} Because Pluto and Charon are so small and far away, they are extremely difficult to observe from Earth.