Module 2: Stories of the Present (How Do We Know?):

Earth Science Essentials

How Do We Know? Exploring Places We Can't Go

This unit considers how we can study the temperature and composition of stars even though we can't go there. Individual lessons will open in a new page--simply close the page when done and return here.

• How Do We Know the Stars--Lecture (5:22 min)


• What Are Stars Made Of—interactive text


• Extra Resources: Hyperspace and the Electromagnetic Spectrum. Writing exercise.

10/27/2017--pictures and text copyright Russ Colson