Light echoes are a phenomenon in which light that has been emitted by a source such as a star or a supernova is reflected off surrounding interstellar dust or gas, causing delayed and sometimes distorted images of the original light to be observed. These echoes can provide valuable information about the properties of the surrounding environment, the time and intensity of the original light source, and the dynamics of the interstellar medium. Light echoes are often studied in astronomy to better understand the processes occurring within galaxies and other astronomical objects.