A recent study published in the Proceedings of the National Academy of Sciences takes a critical look at the Late Heavy Bombardment hypothesis, a theory resulting from study of lunar samples returned by the Apollo missions.
You can read more about the study in New Scientist here, and The Atlantic here, including comments from Center from Meteorite Studies Director Meenakshi Wadhwa!
Read the full article, "Illusory Late Heavy Bombardments", here!