Since the distances to the stars cannot be measured directly, astronomers use a variety of techniques including triangulation and parallax, comparison of absolute and apparent magnitude, and Cepheid variables. Triangulation is an indirect method of measuring the distance to an object by imagining a triangle between the observer at two positions and the object (see Fig.1). Parallax, as used in this activity, is the apparent motion of a relatively close object when viewed by the observer from two different positions. In this activity, students learn how parallax and triangulation can be used to indirectly measure the distance to stars. Students will also consider the limitations of using parallax to measure the distance to objects that are further away.
Categories: Lab/Student Activity
In this activity, students will be analyzing a soil sample taken from a mining site and testing if for its acidity and dissolved metal contaminants. They will design a filtration system to remove the... read more
This resource shows the reader how to use the Clips App in a way that allows students to create a digital story about a cell. There are excellent examples of how the final product is supposed to look... read more