The phrase "small craters" refers to small, bowl-shaped holes or indentations found on a surface, often caused by impacts from objects in space. Full definition
From the number of small craters on its surface, we can estimate that Gaspra is about 200 million years old. (nineplanets.org)
This image taken by NASA's Dawn spacecraft presents two small craters on Ceres, located in the vicinity of Toharu Crater. (jpl.nasa.gov)
This raisin - like shrinkage occurred no more than 1 billion years ago, based on the age of pre-existing small craters that the scarps run through (Science, DOI: 10.1126 / science.1189590). (newscientist.com)