Ohm (crater)

Ohm is a large crater on the far side of the Moon. It is found near other craters, such as Comrie to the north and Shternberg to the northwest. This crater was named after Georg Simon Ohm, a famous German scientist who studied electricity.

Ohm is special because it is the start of a ray system. These are bright lines that stretch far across the Moon’s surface. The area right around the crater looks different from the rest of the Moon, with lighter-colored streaks going in many directions.

The edges of Ohm are very clear, except for a small rough part on the south side. Inside the crater, the ground slopes down to a flat floor. Unlike some other craters, Ohm does not have a big hill in the center.

Before it was officially called Ohm in 1970, this crater was known as Crater 253. It is part of what scientists call the Copernican System because it is very young and has these bright rays.

Artemis II

The view of crater Ohm and its surroundings was seen by astronauts during the lunar mission of Artemis II in April 2026. The bright, chevron-shaped rays of Ohm were clearly visible as the moon showed more of its western hemisphere and the far side regions.