Refracting telescope focus, results in a non-inverted and upright image. Galileo’s best telescope magnified objects about 30 times. Because of flaws in its design, such as the shape of the lens and the narrow field of view, the images were blurry and distorted. Despite these flaws, the telescope was still good enough for Galileo to explore the sky. The Galilean telescope could view the phases of Venus, and was able to see craters on the Moon and four moons orbiting Jupiter. Parallel rays of light from a distant object (y) would be brought to a focus in the focal plane of the
Lunar craters named lunar craters are "satellite craters": their names consist of the name of a nearby named crater and a capital letter (for example, , , and so on). Lunar crater chains are usually named after a nearby crater. Their Latin names contain the word "Catena" ("chain"). For example, "Catena Davy" is situated near the crater Davy. The red marker on these images illustrates the location of the named crater feature on the near side of the Moon. 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