In the 20th century, the story of our Universe’s origins was a shifting and incredibly strange tale. Around 1980, the physicist Alan Guth developed the idea of cosmic inflation or the notion that physical space experienced an exponential expansion immediately after the Big Bang. But in this series, we have reported on countless discoveries that in effect falsify the foundations of the Big Bang theory. Nevertheless, it remains the dominant view in 21st-century cosmology. In this episode, Thunderbolts Picture of the Day managing editor Steve Smith offers his analysis of the current state of Big Bang cosmology, and specifically the evidence for and against cosmic inflation.