Try plotting the motion of the planets in the sky, and maybe you'll see that they not allways move in a straight line. All the planets move in just about the same plane, also the same plane that the Moon encircles the earth in. Therefore from time to time the brighter planets can be seen moving behind the Moon in what is called occultations. Great fun to watch, but you might nead binoculars. You can see what particles react just by looking at the colors.
Comets graze the heavens from time to time.
Some are very bright, but most others require a telescope. But the really bright comets are magnificent. Dark bands of gas in the Milky Way block out light from a lot of stars in the bright band of stars the run across the sky at night. You can see places where the abundance of stars is a lot less than elsewere in the Milky Way. These dark patches is made of dust, molecular hydrogen and other molecules.