Many stars are actually arrangements of two or more stars that orbit each other. The stars in multiple star systems may be different sizes, brightnesses and colors. Variable star observing is one area in which amateurs can contribute greatly to the science of astronomy, because professional astronomers do not have the time necessary for such observations. The Pleiades Star Clusters Star clusters are close associations of thousands of stars or more. They can be open clusters or globular clusters.
Star clusters offer spectacular views in a small telescope.
Nebulae Nebulae are clouds of gas and dust in interstellar space. It is easily seen with the naked eye as Orion's sword. It has a large gas and dust cloud, with an inner triangle of stars called the Trapezium . I can see the gas, but not with the detail of the Hubble image shown here. No amateur telescope has that degree of detail.