An exoplanet (http://en.wikipedia.org/wiki/Exoplanet) is a planet located outside our solar system. At this moment (october 2014) there are over 1500 exoplanets confirmed. It is very probable that every star in our galaxy holds at least one planet.
Exoplanet data is open and can be found at http://exoplanet.eu/
Distance from the Sun to the exoplanet's star, measured in Astronomic Units
Azimuth angle, in degrees
Elevation angle, in degrees
An instance of Spherical with the position
Planet mass, in Jupiter mass
Planet radius, in Jupiter radius
Measured in [Earth's] days.
Whether any molecules were detected
Inclination over its axis, in degrees
Estimated temperature, in ºK
Usually something strange
See Galaxy