“Luminous” tells the story of the first astronomer in history to publicly predict the near-future explosion of a star. But will he be right? Others in the astronomical community are skeptical, and professional reputations hang in the balance. In production since 2014, “Luminous” follows Calvin College astronomy professor Larry Molnar’s five-year journey to test his unprecedented prediction, knowing that its success or failure will unfold squarely in the international spotlight.