The first is a relatively simple and inexpensive activity that will help students make a mental picture of the comet. You'll need construction paper, cotton balls, glue, scissors and crepe paper.
Kids can work individually.
A drawing on the board would be adequate. Have the kids glue the cotton ball to the construction paper. The crepe paper will be used to represent the tail of the comet. They should practise drawing a triangle first, then draw a triangle on their sheet of crepe paper with a soft marker like a crayon so that their paper doesn't rip. A 20cm by 60cm piece of paper would do nicely.