|The two major tools that astronomers have at their disposal for studying the universe are spectroscopy and imaging. Last week you learned about spectra and how they can be used to determine the elements that are found in stars and how they can be used to differentiate between different kinds of stars. This week we will learn about imaging and photometry. Photometry is simply the measurement of the amount of light coming from an object. We will address astronomical photometry in three steps. We will then look at how we use imaging across the electromagnetic spectrum to learn about the nature of cosmic objects.|
In this lab you will learn about how astronomers determine the brightness of an astronomical object such as a star or a galaxy. This is called astronomical photometry and you will use this technique to do some of your own research. Starting with laboratory measurements of the brightnesses of light bulbs you will go on to measure the brightnesses of certain stars and even portions of a galaxy. You will also learn about how astronomers observe color, and the importance of observing objects over the entire electromagnetic spectrum.