Clusters of stars form from the collapse of giant molecular clouds. Astronomers can study the properties of these giant molecular clouds by the radio emissions that their molecules radiate. Through these radio observations, they can understand properties of these clouds, such as their size, density, and the constituents of the clouds. This article gives the results of radio observations of a giant molecular cloud called W43. These astronomers used radio emissions from formaldehyde in the cloud to map its size and structure, giving researchers better insights into how these types of molecular clouds form and later collapse into star clusters.