NASA has released an image of the supernova remnants Cassiopeia A, or simply Cas A, captured by the WISE space telescope at infrareds. There’s no historical record of that supernova even though its light reached Earth around 1667 A.D., probably because a large amount of dust between it and the Earth greatly dimmed its brightness. Its various emissions made it possible to study it with different instruments over the last few decades. WISE detected the echoes of the light burst that are generating ripples outwards from the star that exploded.