True or false
coma refers to the bright head of a comet.

True

Explanation: Coma refers to that part of a comet that appears as a enveloping surface surrounding the nucleus of a comet. It forms when a comet passes close to the sun in an elliptical orbit. Due to this, the water in the comet gets vaporizes as it approaches the sun, forming the outer layer of it. It is comprised of carbon monoxide (CO), ammonia (NH₃), carbon dioxide (CO₂), methane (CH₄), long with ice and dust particles. It is the most distinct part of a comet, forming the head of a comet.

Hence, the above statement is true.