Lunar craters Lunar craters Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, almost all of which were formed by impacts. The word "crater" was adopted from the Greek word for vessel - (Κρατήρ a Greek vessel used to mix wine and water). Galileo built his first telescope in late 1609, and turned it to the Moon for the first time on November 30, 1609. He discovered that, contrary to general opinion at that time, the Moon was not a perfect sphere, but had both mountains and cup-like depressions. These were named craters by Schroeter (1791), extending
Craters of the Moon (geothermal site) in diameter. The most powerful fumarole observed at Craters of the Moon occurred December 1967. It had a heat output of 116 MW. Currently, only one of the craters has a mudpool. Here the gases (mainly HS) react with water to form sulphuric acid. This reacts with the rocks, turning it to clay. When there is water present, this forms the grey coloured mudpools “that bubble and burp as steam and gas escape through them”. Much of the ground at Craters of the Moon is warm or hot. This of course affects the vegetation. Only few species can survive. One