Re: Is that true that there is a fissure or crevice in the moon ?

Yes, there are fissures and crevices on the Earth's Moon. The Moon has a long history and scientists are still debating over which of the several theories account for the most observed features. A huge amount of information was gathered during the 1970's Apollo missions that orbited the Moon and took relatively close-up photographs of the surface. Additional information was gathered from the seismograph instruments left on the surface of the Moon that recorded the scock waves produced by later crashes of debris left by the Astronauts in decaying orbits. Early asteroid and meteor bombardment of the Moon, and the Earth for that matter, caused the entire surface to become molten. Lava flowed just as it does here on Earth. Some of the lava tubes emptied themselves and allowed long furrows of the Moon's surface to sink, causing fissures. Uneven cooling of the surface caused cracks in the Moon's crust, causing crevices. Later meteor impacts made craters and more limited molten areas on the surface of the Moon, producing smaller lava flows. An excellent source for more information on the surface of the moon is NASA. The index page of one site follows: http://www.hq.nasa.gov/office/pao/History/SP- 362/contents.htm Choose 4. The Maria, and 7. Unusual Features, for some truly fine photographs and text explaining the images. The sutdy of these Moon reports presents some exciting opportunities to do space exploration without leaving home.