Davros had hoped to use the sun of Skaro as a power source for Dalek time travel, but instead the resulting supernova wiped out the planet and, presumably, the Daleks themselves.
Davros had hoped to use the Hand to transform the sun of the Dalek homeworld Skaro into a power source for time travel, but the Doctor had planted a booby trap into the Hand's programming. The resulting supernova wiped out Skaro and, presumably, the Daleks themselves.