The journal
Open the journal →The conversation starts in the journal — be the first to post.
About Challis
Challis is a lunar impact crater that is located in the northern regions of the Moon's near side, close enough to the limb to appear significantly foreshortened when viewed from the Earth. It is joined to the crater Main through a break in the northern rim, and is close to Scoresby along the southeast side.
Everything about Challis →