What is the largest planet in the galaxy?

1 Answer
Jan 24, 2016

The largest known planet so far seems to be Wasp-17b with a diameter 249,000km about twice that of Jupiter but significantly lower mass.


Wasp-17b has a very low average density, which has been compared with that of a polystyrene cup.

Another larger possible candidate planet is HAT-P-32b, but that may be a brown dwarf (Wikipedia)