When a group of astronomers in Sweden thought they found a new object in the far reaches of the solar system, they were cautiously excited. Rather than waiting to go through the long scientific publishing process, they quickly posted their findings online, inviting other astronomers to double-check their work. The reason for the buzz? The team thinks they may have found a new, relatively large body out in Pluto's territory, something that may even be akin to the long-sought "Planet X." But don't get too excited, planet fans. The Swedish team got their wish, and other astronomers reacted almost immediately to the online paper with largely skeptical takes. "The sad thing is, this is a legitimate field of inquiry," says Mike Brown, an astronomer at the California Institute of Technology who has discovered objects out past Neptune's orbit. "Then a paper like this comes along and people think it's crazy." The hunt for hidden planets in the solar system has a long history, and is not without