The nucleus of Comet Tempel 1 has been described as a "rubble pile,",a loose accumulation of material held together by gravity.In this,it is similar to:

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Miranda, the satellite of Uranus, is also classified as a "rubble pile" due to its irregular shape and jumbled terrain, which suggests that its interior is composed of multiple fragments held together by gravity. Charon, the largest satellite of Pluto, is also believed to be a "rubble pile" due to its low density and irregular shape. However, Ceres is believed to have a more solid, differentiated interior, with a rocky core and an icy mantle, while Vesta is thought to have a differentiated interior with a metallic core and a rocky mantle.

The Nucleus of Comet Tempel 1 Has Been Described as a "Rubble