The Exploratorium in San Francisco has offered up this rather fun and interesting activity which gives interested parties the information to build their own scale model of the solar system. Visitors can start by filling...

Stars live for a very long time compared to human lifetimes. Your great, great grandparents saw the same stars as you will see tonight (if it's clear). Our lifetimes are measured in years. Star lifetimes are measured in...

Created by Richard W. Pogge of Ohio State University, this movie demonstrates trigonometric parallax. The top half of each frame shows the appearance of a star in the sky as seen from the Earth, and the bottom half shows...