To learn about the universe we first need to understand what the universe is. Universe is all of space and everything in it including stars, planets, life, etc. Everything is made out of the same matter, you, me stars, everything. Groups of stars relatively close to each other is called galaxy. As the universe expands accelerated galaxies are moving away from each other faster and faster. If we don't perfect our space technology soon, we won't be able to travel to other galaxies ever. We will be left alone in our galaxy - The Milky Way, to search for life and friends. In the Milky Way there are 100 billion (milliard) stars and most of them have planets orbiting them.
