Name the frozen, small entity in the Solar System that heats and starts to emit gases as it approaches the Sun.

Comets are solar-orbiting snowballs of frozen gases, rock, and dust. They are the size of a small town when frozen. However, when a comet's orbit gets close to the Sun, it warms up and ejects dust and gases into a massive blazing head the size of most planets. Astronomers believe there are billions of comets circling our Sun.

Asked by Vasilii Kulev · Last updated 4 years ago · 4K views · SOURCE