how that name? comets

comets probably derive their name from their tail, as in Latin comets means long haired. comets may originate in a huge cloud called the Oort cloud that is supposed to surrounded solar system.extremely bright comets such as hale-hope are rare,not all comets have tails.the tails takes shape only when the comets gets close to the sun when firsy viewed throuh a telescope the bright head of a comets called coma looks like a hazy dot . sometimes a coma contains a star like point called a nucleas.solar enery warms comet's head as it moves sunward and vapourises the frozen crystallized gases.these gas stream out and form a spectacular ,glowing tail behind the comet's head.