How did Dawn's GRAND instrument detect (probable) ice a short distance under much of Ceres's surface? a Actually, the GRAND instrument showed that Ceres's surface is probably underlain by a layer of hot molten magma, similar to the magma underneath the volcanoes of Earth or Io b Dawn used a radar instrument to see through the top layers of impact-shattered bedrock and reveal dense, cold ice. c It found evidence of hydrogen atoms, which could easily be present in H2O molecules. d Dawn dropped a series of "impactor" probes onto Ceres's surface, which penetrated a few meters and sampled the ice directly.

How did Dawn's GRAND instrument detect (probable) ice a short distance under much of Ceres's surface? a Actually, the GRAND instrument showed that Ceres's surface is probably underlain by a layer of hot molten magma, similar to the magma underneath the volcanoes of Earth or Io b Dawn used a radar instrument to see through the top layers of impact-shattered bedrock and reveal dense, cold ice. c It found evidence of hydrogen atoms, which could easily be present in H2O molecules. d Dawn dropped a series of "impactor" probes onto Ceres's surface, which penetrated a few meters and sampled the ice directly.