Complete the concept map by correctly adding the connecting phrases or terms provided to the appropriate locations. contains billions of orbits began to expand rapidly following the converts simple elements such as gas and dust formed destroyed in an explosion known as present in formed early versions of for example to more complex forms such as Milky Way Hydrogen & helium Supernova Oxygen & carbon The universe Contains billions of For example Big Bang Galaxies Some are orbited by Planets Cosmic debris clouds Stars Earth For example Sun