| Flap 1 | Flap 2 |
| the percentage of the universe that is composed of atoms (matter) | 4% |
| the percentage of the universe made of "dark energy" | 73% |
| the percentage of the universe made of dark matter | 23% |
| a type of matter that does not give off light but does have gravity | dark matter |
| a theoretical, undetectable energy that opposes gravity | dark energy |
| the approximate age of the universe (per the big bang theory) | 14 billion years |
| the astronomer who developed the law that states: the farther away a galaxy is from Earth, the faster it is moving away | Edwin Hubble |
| elements formed immediately following the big bang | hydrogen, helium, & lithium |
| the elements that are sythesized within stars (atomic number range) | 4 through 26 |
| the elments formed through supernova explosions (atomic number range) | 27 & larger |
| the study of the origin, properties, processes, and evolution of the universe | cosmology |
| approximate percentage of stars that exist in multiple-star systems | 50% |
| the recycling-center for stars | nebulae |
| astronomers around the world have agreed that there are this many official, standard constellations | 88 |
| the theory that all matter and energy in the universe was compressed into a small volume, then exploded | The Big Bang Theory |
| radiation uniformely detected from every direction in space | Cosmic Background Radiation |
| the small volume of matter and energy that exploded at the time of the "Big Bang" | the primordial atom |
| the lengthening of a wave due to movement away from another object | red-shift |
| the astronomer who first theorized that all of the universe was once contained in one spot in the universe | George Gamow |
| the scientist who accidently gave the "Big Bang Theory" its name -- althought he did not believe in it | Fred Hoyle |
