It could have been struck by a micrometeor or it could have been struck by some debris.    From Wordnik.com.  [CNN Transcript Jun 19, 2007] Reference

Because they want to make sure that while they're in space they want to make sure they didn't get dinged by a micrometeor.    From Wordnik.com.  [CNN Transcript Jun 10, 2007] Reference

Signals-and detection was getting a lot of routine stuff Van Allen count, micrometeor count, surface temperature, gravitationfield strength, radar and scanner echoes.    From Wordnik.com.  [Space Viking]

On the ground, NASA engineers poring over images of that chipped heat shield and some tiles, and the leading edge of the left wing seen there, which was hit ever so slightly with a micrometeor yesterday.    From Wordnik.com.  [CNN Transcript Dec 12, 2006] Reference

So what would it be worth to you if I told you, I had on the Moon, right now, several million gallons of distilled water frozen into a anti-radiation/micrometeor habitat and inside were several million gallons of liquid oxygen and liquid hydrogen.. and a half gallon of He3?.    From Wordnik.com.  [Obama to Unveil "Ambitous" Plan for NASA | Universe Today] Reference

U.S. researchers say they have developed a thin film designed to protect small spacecraft from temperature extremes, corrosion and micrometeor impacts.    From Wordnik.com.  [Space News From SpaceDaily.Com] Reference

Signals-and-detection was getting a lot of routine stuff -- Van Allen count, micrometeor count, surface temperature, gravitation-field strength, radar and scanner echoes.    From Wordnik.com.  [Space Viking] Reference

The researchers said the film also has a protective layer of germanium silicon oxides to protect a spacecraft from the corrosive effects of atomic oxygen and from micrometeor impacts.    From Wordnik.com.  [Space News From SpaceDaily.Com] Reference

Very little micrometeor-ite scoring, even.    From Wordnik.com.  [Passage at Arms]