Category
page 1Exoplanets

exoplanet
alt=Timelapse of exoplanets orbit motion|thumb|upright=1.5|Four exoplanets of the HR 8799 system imaged by the [[W. M. Keck Observatory over the course of seven years. Motion is interpolated from annual observations.]]
thumb|295x295px|Comparison of the size of exoplanets orbiting Kepler-37 to Mercury, Mars and Earth
An exoplanet or extrasolar planet is a planet outside of the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first detected in 1988, was confirmed in 2003.

mini-Neptune
thumb|upright=1.1|Artist's conception of a mini-Neptune or "gas dwarf"
Earth Similarity Index
Proposed scale on how similar a Planetary-mass object or natural satellite is to earth
super-Jupiter
thumb|Artist's impression of 2M1207b
A super-Jupiter is a gas giant exoplanet that is more massive than the planet Jupiter. For example, companions at the planet–brown dwarf borderline have been called super-Jupiters, such as around the star Kappa Andromedae.
Habitability in yellow dwarf systems
area of study
list of extrasolar planets
Wikimedia list article