Telescope earliest existing record of a telescope was a 1608 patent submitted to the government in the Netherlands by Middelburg spectacle maker Hans Lippershey for a refracting telescope. The actual inventor is unknown but word of it spread through Europe. [[Galileo Galilei|Galileo]] heard about it and, in 1609, built his own version, and made his telescopic observations of celestial objects. The idea that the [[Objective (optics)|objective]], or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope. The potential advantages of using [[parabolic reflector|parabolic mirrors]]—reduction of [[spherical aberration]] and no
Metius (crater) Metius (crater) Metius is a lunar impact crater located in the rugged highlands to the southeast of the Moon's near side. At this location, from Earth, the crater appears oval due to foreshortening, but the crater is actually nearly circular. To the southwest the rim is attached to the crater Fabricius. Offset to the west-northwest is the heavily worn crater Brenner. Further away to the northeast is the crater Rheita and the long gorge Vallis Rheita. The rim of Metius does not protrude prominently into the surroundings and has an insignificant rampart. A few small craters mar the outer wall,