Here’s a simple activity we did to help us understand how the universe is expanding. We’d been reading about black holes and stars collapsing and such, and the Apologia text went on to reassure us that we don’t have to worry about getting sucked into a black hole. Since the universe is expanding we are moving farther away from any black holes that may be out there. To illustrate, Skeeterbug drew galaxies on a balloon that hadn’t been blown up. Then we blew it up to show how they got further apart as the balloon expanded. Pretty obvious, right? But he didn’t believe me until we measured the distance between galaxies with a ruler!
This lesson on stars and galaxies is a bit longer than many of the others. Just one lesson to go after this!