Comet nuclei are not uniform in composition.
What is Comet nucle?
"The cometary nucleus consists primarily of water ice, which sublimates off the surface when the comet approaches the Sun. "
What are comets ?
"Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices." They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a planet. This material forms a tail that stretches millions of miles.
What is deep impact mission ?
"The primary mission of NASA's Deep Impact was to probe beneath the surface of a comet. The spacecraft delivered a special impactor into the path of Tempel 1 to reveal never-before-seen materials and provide clues about the internal composition and structure of a comet. Deep Impact spent almost nine years in space."
What is comet Tempel 1 ?
"Tempel 1 is a periodic Jupiter-family comet discovered by Wilhelm Tempel in 1867. It completes an orbit of the Sun every 5.5 years. Tempel 1 was the target of the Deep Impact space mission, which photographed a deliberate high-speed impact upon the comet in 2005."
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