Talk:List of largest exoplanets/workpage

Below is a list of the largest exoplanets so far discovered (and possible candidates), in terms of physical size, ordered by radius and separated into categories by types. The units of measurement used are the radius of Jupiter (71,492 km) for the largest gas giants, and the radius of Earth  (6,378.137 km) for the largest terrestrial planets.

Overview
Planets are celestial bodies that is massive enough for its self-gravity to achieve hydrostatic equilibrium and rounded. Any planet that are outside Earth's Solar System is called an exoplanet or extrasolar planet. Gas giants are the largest type of planets, but not enough to sustain core fusion like a star, thus are sometimes called failed stars. It is believed that when Jupiter formed about 4.6 billion years ago, it was about twice its current size, or about 140,000 km in radius. It is currently still shrinking by about 1 mm/yr.

Many hot Jupiters were discovered to have radii in excess of 1.2 times that of Jupiter. Before cooling and contracting. Although hot Jupiters can be very large, there are theoretical reasons their radii cannot exceed approximately $2.2 Jupiter radius$, which is in good agreement with the current observations.

Among terrestrial planets, super-Earths below $10 Earth mass$ $1.5 Earth radius$. Terrestrial planets above this mass have been discovered though, and were therefore dubbed "mega-Earths". However, it is estimated that most planets above $2.4 Earth radius$ have large hydrogen envelops, leaving only a small minority of them being massive mega-Earths. It is possible that some mega-Earths would be the remnant cores of a Jupiter-like or Neptune-like planets, to which those objects are also known as "chthonian planets". Studies suggested that massive solid planets and hundreds of thousands of blanets may be able to form around massive stars and supermassive black holes inside active galactic nuclei with masses up to approximately $4,000 Earth mass$ or, which is used in the IAU's working definition of an exoplanet. In comparison, the mass of Jupiter is $318 Earth mass$. The maximum radius of a such planet is roughtly $5 Earth radius$ (for homogenous water ice planets) or $10 Earth radius$ for a planet with an average internal density similar to that of the Earth, because mass above $1,000 Earth mass$ would causes the planet to compress due to the hydrostatic equilibrium, hence decreasing its radius.

Caveats
Those lists of extrasolar objects may and will change over time because of inconsistency between journals, different methods used to examine these objects and the already extremely hard task of discovering exoplanets, or any other large objects for that matter. Then there is the fact that these objects might be brown dwarfs, sub-brown dwarfs, or not exist at all. Because of this, this list only cites the best measurements to date and is prone to change.

Brown dwarf. Some of planetary-mass objects such as OTS 44 might be even sub-brown dwarfs. The mass estimates are also included in the lists.

Gas giants
All planets listed are larger than 1.7 times the size of the largest planet in the Solar System, Jupiter. Some planets that are smaller than have been included for the sake of comparison.

Terrestrial planets
All planets listed are larger than 1.5 times the size of the largest terrestrial planet in the Solar System, Earth.