Mars has the biggest volcano named Olympus Mons.
Mars.
mars
Olympus Mons, on the planet Mars.
Well i am doing a research on Mars and the biggest volcano would be Olympus Mons. But NASA is not sure if that might be in the whole galaxy! But take that answer for now, i will updated this answer later on!UPDATED
"Mauna Kea"
Olympus Mons
IlaueaKilaueaK
The largest known volcano in the solar system is Olympus Mons, which is on Mars.
apollos did not have a planet it is the biggest star in the world its the sun
Saturn.
Saturn!!!!!!!!!!!!