SOLAR SYSTEM

Detailed explanation-1: -When far from the sun, a comet is like a stone rolling around the universe. But when it approaches the sun, the heat evaporates the comet’s gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun’s radiation pressure.

Detailed explanation-2: -When comets come near the Sun, their tails become visible because heat from the Sun vaporizes some of the icy nucleus or head and sunlight reflects from the vapor. Solar wind pushes the vapor in a direction away from the Sun to form the comet’s tail.

Detailed explanation-3: -When comets approach the Sun, some of their ices melt. This causes another notable difference between asteroids and comets: comets have “tails” while asteroids generally don’t.