Supernova remnants in the Milky Way Galaxy
Chandra X-ray Observatory
After a star explodes in a supernova, its remains can be reborn multiple times as new stars. These subsequent generations may be filled with elements heavier than helium that astronomers call metals, which could explain why the universe is inexplicably filled with metal-rich stars.
We tend to think of a supernova as an explosion, but in the final stages of its evolution, it collides with particles of the surrounding interstellar material and begins to implode instead. This produces a dense cloud of gas and dust in which all matter is concentrated…
Source: www.newscientist.com
