Describe asteroids in statements wherein the first letter spells ASTEROID.

A - Asteroids are massive.
S -
T -
E -
R -
O -
I -
D -

1. What makes up a comet?

2. Where do comets originate?

3. Why does the tail of a comet seem to grow longer as the comet travels closer to the Sun?

4. How do meteor showers occur?