Telescopes can see exoplanets but its not enough to prove that what you really see from the telescope is a planet. It may only be a satellite. There are really a lot of things to find and discover in space. The solar system might have a world orbiting in its outer limits that might be detected by a telescope in space. The behavior of comets and a recently found dwarf planet have led astronomers to believe that a huge undiscovered planet might exist. A set of astrophysicists hopes that data from NASA's WISE infrared telescope offers proof that a planet larger than Jupiter they have called "Tyche" does exist.