When a comet hits a tidally locked exo-Earth / Astronomers discover a planet that's rapidly disintegrating, producing a comet-like tail / Are comets responsible for 'abundant' presence of water on Earth? / 'Crumb trails' of meteoroids could reveal potentially dangerous comets years before they reach Earth / Astronomers predict the orbits of potentially hazardous comets from meteor showers / Meet Phaethon, a weird asteroid that thinks it's a comet - our new research may explain what's going on / Comets that 'bounce' from planet to planet could spread life across the universe / 'Bouncing' comets could deliver building blocks for life to exoplanets / Testing of citizen scientist discovery suggests it is on the boundary between comet and asteroid