1.   All of the various topographic features observed in lunar craters indicates their impact origin.

2.   I would recommend them only for the casual observer who wants little apart from views of lunar craters.

3.   Long before spacecraft missions first explored the Moon, speculation on the origin of the lunar craters abounded.

4.   They differ from corresponding lunar craters by having no central peaks and by having rather smooth rims.

5.   Impacts of asteroids and comets gouged out many of the larger lunar craters and basins that remain virtually unchanged on the waterless, airless moon.

6.   But up there, among the lunar craters and the abandoned Apollo spacecraft, the moon at high noon is like an oven.

7.   But up there, among the lunar craters and the abandoned Apollo spacecraft, the moon at high noon is as hot as an oven.

8.   Spacecraft set to crash into lunar crater that may contain frozen water.

9.   The finding appeared to confirm earlier speculation by scientists that ice may have collected in the permanent shadows of lunar craters formed by comets, according to the scientists.