|
One of the largest and oldest craters on the Moon, Clavius
Crater measures about 225 kilometers across and was formed
by an asteroid impact probably 4 billion years ago. Though
it is well-preserved, Clavius shows its age by the many
smaller craters within it formed by impacts that happened
later. Clavius is large enough for the unaided eye to see:
one or two days after the Moon’s First Quarter phase,
Clavius is noticeable as a notch in the day-night separating
line (the “terminator”) in the Moon’s southern regions.
|
