Each year around a thousand people attempt to reach the peak of Mount Everest, which is the tallest mountain on Earth, rising up approximately 9 km above sea level. In Mars, the mountain Olympus Mons goes up about 22 km, which more than doubles the height of Mount Everest. Furthermore, Galileo Galilei observed that the Moon also has mountains. What about mountains on other types of astrophysical bodies? How tall are they? Can we climb them?…