The James Webb Space Telescope identified one of the oldest supernovas, AT 2023adsv, revealing early universe phenomena

When Pagan and DePasquale first receive the images, they appear in black and white. The colors are added to the image later, as the data from the various filters are translated into the spectrum of visible light, Pagan explained. The longest wavelengths appear red, while the shorter wavelengths are blue or purple.