Astronomers have made a new discovery when it comes to a transiting exoplanet. They've found that the planet as the longest known year seen to date.
The new exoplanet is called Kepler 421b. It actually circles its star just once every 704 days. In comparison, Mars orbits our sun once every 780 days. That said, most of the 1,800-plus exoplanets that have been discovered are much closer to their stars and have shorter orbital periods.