This lesson provides an introduction into Light.
Light is important to astronomers since this, basically, is what we have available from a celestial source from which to study it.
Understanding Electromagnetic (EM) Radiation is at the source of understanding Light
It is measured in Angstroms and Nanometers, for the most part.
We will use our understanding of Light when we: Select filters for imaging, study stellar properties, examine host stars for exoplanets, and other such areas of interest.