What is a basic fact about Ceres that makes us think it has a lot of water in its interior, probably in the form of ice? a Ceres is tidally heated due to its elliptical orbit around Jupiter, so it can't be mostly solid rock. b The H.E.D. meteorites come from Ceres, so we have samples of some of its ice here on Earth. c The Dawn spacecraft send radar beams through Ceres, and they were partially absorbed by deposits of water ice. d Its density is too low to be made mostly of rock.

What is a basic fact about Ceres that makes us think it has a lot of water in its interior, probably in the form of ice? a Ceres is tidally heated due to its elliptical orbit around Jupiter, so it can't be mostly solid rock. b The H.E.D. meteorites come from Ceres, so we have samples of some of its ice here on Earth. c The Dawn spacecraft send radar beams through Ceres, and they were partially absorbed by deposits of water ice. d Its density is too low to be made mostly of rock.