Shell of a recent supernova
This is the object called G1.9+0.3 by astronomers. It’s about 28,000 light-years from Earth near the center of our Milky Way galaxy. The object is an expanding shell of gas, left behind by the most recent supernova, in Earth’s time frame, known to have occurred in our galaxy.
If gas and dust had not heavily obscured it, the supernova explosion would have been visible from Earth just over a century ago.
A new observation with NASA’s Chandra X-ray Observatory made this image possible. For astronomers, these Chandra observations – made over the equivalent of 11 days of time – reveal new details about the explosion.