Category
page 1Impact events
impact event
collision of two astronomical objects with measurable effects
galaxy merger
process by which two galaxies join into one
asteroid impact avoidance
methods to prevent destructive asteroid hits
stellar collision
coming together of two stars caused by gravity, gravitational radiation, or other mechanisms not well understood
impact winter
hypothesized extended period of worldwide cold weather due to the impact of a celestial body on the Earth's surface
neutron star merger
type of stellar collision

gravitational keyhole
region of a large body's orbit that could cause a small body to collide with it