A team of astronomers from the United States, France and the UK has observed a tsunami of stars and gas that is crashing midway through the disk of the spiral galaxy IC 2163. This colossal wave of material – which was triggered when IC 2163 recently sideswiped another spiral galaxy, NGC 2207 – produced a giant ocular (eye-shaped) structure. This image, a composite of data from ALMA and the NASA/ESA Hubble Space Telescope, shows a very rare cosmic...