Composite image of Arp 26, also known as M101 or the Pinwheel Galaxy.
X-ray observations from NuSTAR (green) show a supernova four days after the explosion. The data are overlaid on a visible light (NOIRLab/KPNO, yellows and reds) and far-UV (GALEX, blue) image.
Credit: NASA, JPL-Caltech, NOIRLab, NSF, AURA, B. Grefenstette, R. Hurt
Source: https://www.nustar.caltech.edu/image/nustar240125a