Last week's debut lecture in the UA College of Science's Cosmic Origins series was so crowded that they had to turn away some folks at the door of Centennial Hall—and others had to settle for sitting the aisles. This is a hot ticket on Tuesday nights. 100% free.

Tonight, you can learn how it all got started. And by all, we really mean all, courtesy of Christopher D. Impey, distinguished professor in astronomy:

The scientific story of creation begins 13.7 billion years ago in a circumstance of incredible temperature and density, when all matter and radiation was contained in a region smaller than an atom. The big bang is now a mature theory, with a web of observational evidence supporting it; and the size, shape and age of the universe have been measured with impressive accuracy. This talk will tell the story of how an iota of space-time turned into a vast cold universe of 100 billion galaxies.

Details here.

Or, y'know, you can turn to Bill O'Reilly for your science.