The very smooth plains unit was formed in some young craters.

Eastman exhibits some features characteristic of a fresh, relatively young crater.

This is a young crater with a rim and interior that have not yet been significantly eroded.

The scientists said the more recent period of bombardment came from relatively small objects, which have left few young large craters on the Moon.

They stopped once more that afternoon to set out another one, then anchored for the night in the lee of a crisp young crater.

There are young craters on the eastern part of the ridge.

Relatively young craters with rays of ejecta are also visible.

"Everything looks so fresh we haven't been able to figure out which are the youngest craters," he said.

The smaller, younger craters were wells of darkness in the flat light.

The rays cut across older craters, while a few younger crater have formed on top of them.