when these were seen in the past, they often caused a great deal of fear among primitive people.

this is because they were thought to be an omen of something terrible that was going to happen.

these day,however,we understand exactly what they are quite common in space, but can only occasionally be seem from earth.

they consist of a soild head, known as the nucleus, and a tail made up of many smaller objects spread far apart.

surprisingly, the head can be more than a million kilometers in width, and the tail can stretch out for more than 100 million kilometers.
급해서요 ㅠ.ㅠ 내일이시험인데..해석부탁드립니다!