According to US astrophysicists up to half of all matter in our Milky Way galaxy comes from distant areas in space, driven here on strong interstellar winds, created when stars explode in spectacular supernovae.
When Carl Sagan, the late American astrophysicist, made his well-known comment that ‘we are made of star-stuff’ he meant that all the elements on Earth were once produced in the heart of stars before being flung out into the universe in giant explosions.
