Supernovae are the biggest explosions astronomers have ever beheld. When a large, dying star runs out of fuel, sometimes it will die through a cataclysmic explosion. This explosion forms many of the elements that we see here on Earth, which is evidence to say that you and I are made out of the dust of a supernova.
This is a remnant of supernova. It exploded many eons ago. All that remains is a giant cloud of gas and dust, which holds the building blocks of the planets and of life.