This title includes these seven wonders: solar flare (large explosion in the sun's atmosphere), a total solar eclipse (when the sun is totally obscured by the moon), a neutron star (star composed of neutrons that has collapsed under its own gravity), a supergiant star (among the most massive stars), a supernova (stellar explosion that is more energetic than a nova - a star that suddenly increases its light output tremendously and then fades away to its former obscurity), a black hole (region of space from which nothing, including light, can escape), and a nebula (cloud of gas and dust in space).