For the first time, a burst of radio waves hundreds of millions of times more energetic than the sun was caught red-handed as it slammed into the Earth. In recent years, astronomers have retroactively spotted a wacky signature in their data: Every now and then, torrents of energy that last a few thousandths of a second wash over Earth. These so-called "fast radio bursts" (brief bursts of radio waves) are currently on the list of unexplained cosmic phenomena. (artists rendition)
