Background Check UNIT What do you know about the Big Bang Theory and the other planets in our galaxy? What do you know about our moon, tides, gravity and the orbit of the Earth? 2 - EARTH'S PLACE IN THE UNIVERSE Put a next to words you can define Put a -- next to words you have heard before Put a ? next to words you have never seen. Eclipse Equinox Revolution Rotation Solstice Tide Waning Waxing Galaxy Lightyear Star Planet Moon Meteor Comet Solar System Dwarf Plant Orbit Asteroid What else do you want to learn about this topic?