Science ObjectDigital resources are stored online in your NSTA Library.
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach.
This Science Object, co-developed between NASA and NSTA, is the second of four Science Objects in the Earth, Sun, and Moon SciPack. It provides an understanding of how we know that Earth moves in a nearly circular orbit around the Sun once per year, so that we see different constellations at different times of the year. Earth rotates on its axis once per day, making it appear as though the Sun, the Moon, and the stars revolve around Earth each day. Evidence however, demonstrates that it is in fact, Earth that rotates on its axis as it orbits the Sun, just as other planets in our solar system.