We might just be on the verge of discovering a real Planet X, according to astronomers John Matese and Dan Whitmire. Subtle gravitational influences on comets way out in the Oort Cloud suggest there could be a huge gas giant affecting the other objects, and now NASA's Wise space telescope has given us the data to determine whether the planet really exists or not. For more on what Tyche might look like, check out The Independent - and for a little healthy skepticism about whether Tyche is really out there, check out Bad Astronomy.