  We obtain the gravitational emission from particles scattering via the Yukawa
interaction, presenting both classical and approximate quantum results. We also
estimate the contribution from the tensor part of the internucleon interaction.
This emission is the main source of a very-high frequency component to the
stochastic background in the Solar System and in neutron stars. The emission
from the Sun (allowing for Debye screening) and from a typical neutron star are
obtained. The gravitational wave luminosity of the Sun is $41 \pm 10$ MW.
