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Our solar system is immense, but it gets lost in the vastness of our Milky Way Galaxy. Look at our place in the galaxy and our galaxy's place in the universe. Examine the different kinds of galaxies including galaxy collisions and the... See more

Do you want to learn about the whole universe in one lesson? Did you know that only a hundred years ago we thought our Milky Way Galaxy was the entire universe? How much of the universe can we really see? Tour the universe with Home... See more

Stars are the workhorses of the universe and account for most of its mass. They come in many shapes and sizes, some as small as just a few miles across and others that are as large as much of our solar system. Some are hundreds of times... See more