• Interplanetary shock waves due to
solar flares and
coronal mass ejections, and originally discovered via
geomagnetic sudden commencements. • The
bow shocks formed around planets in stellar winds, and sometimes around stars themselves. •
Supernova remnants driving a shock through the
interstellar medium (ISM). • Shocks traveling through a massive
star as it explodes in a
core collapse supernova. • Shocks in
interstellar gas, caused by a collision between
molecular clouds or by a
gravitational collapse of a cloud. • Accretion shocks at the edge of
galaxy clusters. ==References==