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About Lalande
Lalande is a small lunar impact crater that lies in the central part of the visible Moon, on the eastern edge of Mare Insularum. It was named after French astronomer Jérôme Lalande. The crater is surrounded by a high-albedo area of ejecta that extends into a ray system with a maximum radius of over 300 kilometers. The interior wall has a terrace system, and there is a small central rise at the midpoint of the floor. It was formed during the Copernican period of the moon extending from 1.1 billion years ago to the present. Its young age is indicated by the bright rays of ejecta surrounding the crater, its sharp features, and the relative lack of later impacts in its interior. The rays of ejecta from Lalande overlay the ejecta rays from Copernicus Crater, meaning it is younger than Copernicus, and thus no more than 800 million years old.
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