in it.
"Areas in the spiral arms that are hidden behind dust in visible light shine through brightly in infrared light, showing where clouds of cool gas are concentrated," NASA wrote at the time.
"There isn't a lot of star formation occurring near the center of M33. It would be difficult to deduce this lack of activity in the core by only looking a visible-light image, where the core appears to be the brightest feature."
NASA added that the galaxy looks "surprisingly bigger" than an optical image would make it appear, because cold dust is visible further in space than what astronomers initially expected.