An international team of scientists has found a Godzilla solar system so extraordinarily large that one far-flung planet orbits its host star at the cracking distance of more than 1 trillion kilometres.

The gaseous giant, prosaically dubbed 2MASS J2126−8140, takes almost a million Earth years to orbit its star, which lies 100 light years away from us.

A photograph captures the planet 2MASS J2126-8140, in orbit around its host star TYC 9486-927-1. Credit:Simon Murphy

"Without a doubt, this is the largest solar system ever found," said ANU astrophysicist Dr Simon Murphy, who collaborated with the research team.

The newly discovered orb is very much bigger than any planet in our solar system, with a mass at least a dozen times that of our solar system's heavyweight, Jupiter.