Studying the line spectra produced by hot gases and absorbed by cooler gases allows us to identify the elements in stars. When a gas is very hot, it doesn’t emit all wavelengths of light.

First, a picture is taken through the spectrometer of the line spectrum generated by the bulb. This is shown below with the known colors from the atomic emission in the CFL annotating the spectrum.

This causes line emission spectra to be produced, as shown below. This is not a continuous spectrum as only light of specific frequencies and specific colours are produced. Different types of ...

ABSTRACT Emission‐line galaxies are an invaluable tool for understanding the evolution of galaxies in the universe. Imaging deep fields with narrowband filters allows not only the selection of these ...