Start out by defining galaxy as groups of billions of stars. Name our galaxy as the Milky Way. Today, we are going to learn about the stars, galaxies, universe, and solar system. Let's compare the differences between galaxies and universe. The universe consists of more than 100 billion distinct groups of stars, called galaxies.
Galaxies are irregular, elliptical, and spiral.
Stars differ in size, color and magnitude. The color of a star is related to its temperature. After the Filmstrip, have the students answer questions on the filmstrip. Whisper to your partner what a universe is and what a galaxy is. There are two theories about how the universe came into existence.