“What is the universe, anyway? To test your knowledge of the universe, please complete the following sentence. The universe (a)   consists of all things visible and invisible—what is, has been, and will be. (b)   began 13.8 billion years ago in a giant explosion called the Big Bang and encompasses all planets, stars, galaxies, space, and time. (c)   was licked out of the salty rim of the primordial fiery pit by the tongue of a giant cow. (d)   All of the above. (Correct answer below.)”