  We present, for the first time, a complete treatment of strongly-interacting
dark matter capture in planets, taking Earth as an example. We focus on light
dark matter and the heating of Earth by dark matter annihilation, addressing a
number of crucial dynamical processes which have been overlooked, such as the
"ping-pong effect" during dark matter capture. We perform full Monte-Carlo
simulations and obtain improved bounds on strongly-interacting dark matter from
Earth heating and direct detection experiments for both spin-independent and
spin-dependent interactions, while also allowing for the interacting species to
make up a sub-component of the cosmological dark matter.
