 So, let's take a look at some of the fantastic celestial remnants of stars destroyed by supernova explosions photographed by the Hubble Space Telescope. We are zooming into sections of the Vale Nebula photographed by Hubble in 1997. This Vale Nebula is the shattered remains of a supernova that exploded some five to ten thousand years ago. This series of images provides beautifully detailed views of the delicate, wispy structure resulting from this cosmic explosion. In 2015, Hubble took another look, overlaying new images with the old. This allows scientists to study how far the Nebula has expanded since it was photographed over eighteen years ago. Despite the Nebula's complexity and distance from us, the movement of some of the delicate structures is clearly visible, particularly the faint red hydrogen filaments. The Vale Nebula is part of a larger Nebula known as the Cygnus Loop. The Cygnus Loop marks the edge of a bubble-like expanding blast wave from a colossal stellar explosion which occurred about fifteen thousand years ago. This image shows a small portion of this Nebula. Although only a few stars per century in our galaxy will end their lives in this spectacular way, these explosions are responsible for making some of the chemical elements heavier than iron in the universe.