Sagot :
Answer:
The short answer is. Solar radiation makes the unstable materials inside the comet to vaporize and stream out of the core, This is what forms a tail. In the far off past, people were both awed and frightened by comets, seeing them as long-haired stars that showed up in the sky unannounced and eccentrically.
Comets leave long beautiful tails when they come close to the sun. 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.