"These stars have exactly the low temperatures and luminosities where a comet could form with the type of composition found in comet Borisov," he explained. Based on its high speed (33km/s ...

We need to find more dark comets, says Taylor. Looking for activity on these objects, particularly when they're the closest to the sun, will also help constrain the composition of these objects ...

A comet is a small celestial body made of ice, dust, and rocky particles that orbits the Sun. It is often referred to as a "dirty snowball" because of its composition. When a comet approaches the ...