About 7,500 light-years away, inside the vast Carina Nebula, sits a dark, cat-shaped wisp of gas and dust that astronomers have nicknamed the Cat's Head Nebula. It is a stellar nursery: a place where new stars are being born right now. Recently both the Hubble and James Webb telescopes stared at the same eerie scene, and the pair of images together shows why astronomers need both telescopes, not just the newer one.

Hubble sees mostly visible and near-ultraviolet light, the kind our eyes are built for. In its view, the Cat's Head looks like a shadowy silhouette: dense dust blocks the light behind it, so the shape appears dark and ghostly against the glowing nebula. That darkness is information, not absence. It maps exactly where the dust is thickest and where starlight cannot get through.

Webb sees in infrared, which slips through dust instead of being blocked by it. In Webb's view the same region lights up with hidden stars and fine structure buried inside the cloud. Stars that are invisible to Hubble appear as bright points, and the folds of the cloud resolve into detail. Neither image is the 'real' one. Together they are a before-and-after of what dust hides and what it protects.