Our Place in the Universe
Planet Earth is part of a Solar System that revolves around the Sun. Our Solar System is located in the Milky Way, which is located in a local group of galaxies, which is located in the Virgo Supercluster, which is located in the Observable Universe. Which means, we are smaller than we think we are!
Many years ago, people thought that the Earth was in the center of the universe. They believed in a Celestial Sphere, which is an ancient theory that stars are just points of light embedded in a sphere surrounding the Earth. We made a model that you can see below.
While Ptolemy's theory about the Earth was incorrect, he published a work on more than half of the constellations. Ptolemy named the constellations based on his Greek and Egyptian culture, so they are full of figures from Greek mythology. Today constellations still serve a map of the universe used by scientists to locate specific stars.
Now we know that the Earth orbits the Sun. This is how we get our seasons. The rotation of the Earth on it's axis brings us day and night.
If you want to see a video of our visit to the Perot Museum (plus some other goodies), click the link below!