Scientists are working on the definition for large planets by comparing their differences to small brown dwarf stars. Large exoplanets are creating the need for an upper limit on planet size.
While searching for brown dwarf stars, astronomers discovered an object 130 light-years from Earth that might be a rogue (or orphan planet) instead of a brown dwarf star.
Using the 8.2 meter Subaru telescope at Mauna Kea, Hawaii, operated by the National Astronomical Observatory of Japan, Carol Grady form NASA’s Goddard Space Flight Center looked in the constellation
A giant star cluster (R136A) in the Large Magellanic Cloud holds the largest star ever found named R136a1. Astronomers believe the star formed with a mass of 320 times the mass of our sun.