Echoes of a Death

Credit: NASA/JPL-Caltech/WISE Team   Supernovae explode with an energy that can outshine an entire galaxy. But just as quickly the star fades from view leaving an expanding bubble of star guts and in the case of Cassiopeia A, a light echo. Explore this gorgeous...

A Bubble of Many Colors

Credit: X-ray: NASA/CXC/SAO; Optical: NASA/STScI; Infrared: NASA/JPL-Caltech/Steward/O.Krause et al.   Supernova remnant Cassiopeia A glows with many colors in this composite image from NASA’s Great Observatories. Zoom into the jumbled strands of colors....

Cassiopeia Fireworks

Credit: NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration In about 1667, a star about 10,000 light years from Earth exploded in the constellation Cassiopeia but it wasn’t noticed by astronomers on Earth. Today, images from NASA’s...