  Bodies such as planets, moons, and asteroids in our solar system are the
brightest objects in the low-frequency radio astronomy at $\lesssim$ 10 GHz.
The low-frequency radio emissions from our solar system bodies exhibit various
observed characteristics in the spectrum, polarization, periodicity, and flux.
The observed characteristics are essential probes for explorations of the
bodies' magnetosphere, atmosphere, surface, and even their interior. Generation
and propagation theories of the radio emissions associate the characteristics
with fundamental physics embedded in the environments: e.g., auroral electron
acceleration, betatron acceleration, and atmospheric momentum transfer. Here we
review previous studies on the low-frequency radio emissions from our solar
system bodies to unveil some outstanding key questions on the dynamics and
evolution of the bodies. To address the key questions by the future
observations with the Square Kilometre Array (SKA), we made feasibility studies
for detection and imaging of the radio emissions. Possible extensions of the
solar system observations with SKA to the exoplanets are also proposed in the
summary.
