At first glance I thought that the conclusion was gonna be that Jupiter was almost a star but it isn't.
Usually in articles about stars when they say size they mean mass! A star "twice the size of the sun" would be a star twice the mass of the Sun rather than twice the diameter or when they say "two Jupiters" they mean two jupiter masses, in this case when they say size they mean size!
The star is about 50 Juppiter masses but is only a little bit bigger than Jupiter. That is really cool but not what I expected from the title!
  