A year after the first congressional hearing on UFOs in 50 years, a House subcommittee revisited some enduring questions around a topic that once would have been laughed off. The hearing, held Wednesday by the House Subcommittee on National Security, the Border, and Foreign Affairs, explored a range of issues related to the baffling realm of unexplained things that humans have observed flying around — now more commonly called UAPs or "unidentified aerial phenomena." Proposed explanations range from the mundane — airborne trash, rogue drones, sensor malfunctions, visual distortions — to the outlandish, like super secret advanced U.S. military technology, sophisticated tech from U.S. adversaries and, yes, alien spacecraft.