What key result did the Deep Impact mission report regarding the comet's composition?

The Deep Impact mission provided valuable insights into the composition and structure of Comet Tempel 1 after its historic collision in July 2005. One of the key findings was that the impact indeed did not penetrate the comet's core, indicating that its internal structure was more robust than previously thought. Additionally, the analysis revealed that the comet contained less water than initially anticipated, which has implications for theories about the formation and evolution of comets.

Furthermore, the material exposed by the impact was found to be tightly packed rather than loosely aggregated, which suggests a denser composition than earlier models had predicted. This information is crucial because it helps scientists understand the physical characteristics of comets and their potential role in delivering water and organic materials to early Earth.

Considering all these aspects, the correct choice encompasses all the significant findings reported by the Deep Impact mission, making it a comprehensive statement on the results regarding the comet's composition.