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.
The students will be researching and discussing the costs and benefits of being the only source of the mineral tin left in the world. In order to prepare for this inquiry, the teacher needs to lay... read more
Categories: Lab/Student Activity
I have been working on involving more open ended questioning in my classes - how can I better incorportate the ideas of inquiry and sustained inquiry in my teaching? The following is the re-working... read more
Some examples of simple but effective activities to help students understand better concepts identified as being challenging. Here are examples that might help you with Sig Digs, Kinematics, and... read more