Which of Saturn's moons has such distinctive equatorial ridge?
The ridge is 13 km high, 20 km wide and 1300 km long. Its origin is not known, but considering the amount of craters, it's safe to assume that it is a very old geological feature.
Answers by country
the United States
the United Kingdom
This is the aurora of Jupiter. What are the visible bright spots caused by?
multiple magnetic poles of Jupiter
Who first described the heliocentric model of the Sun and planets? ( with the Sun in the center)
Aristarchus of Samos
What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?