 Analysis of cratering rates suggests the age of the surface is between about 20 to 300 million years.It was suggested in 2007 that the fresh, steep craters on Gaspra were formed by the Baptistina family-forming event that happened near it.Grooves about to wide, up to long, and tens of meters deep are seen on Gaspra's surface, which may be related to Gaspra's formation along with the rest of the Flora family in an asteroid collision.