Cassiopeia A — nebula, shown live in Cosmoscope, a real-time 3D map of the universe.
The youngest known supernova remnant in the galaxy — a star’s insides flung outward at thousands of km/s. The 3D structure here is NASA’s actual reconstruction from X-ray and infrared data.
Cassiopeia A is placed at its true position on the sky and at its real measured distance, not as a flat backdrop. Fly out from the Sun in the live 3D view and watch it change from a point of light into structure as you approach, with the scale bar showing just how far out you have travelled.