The Kepler project to find planets will continue to grow their database of confirmed planets. As of Dec 5, 2011 the largest are:
by mass = Kepler 14b
by radius = Kepler 17b
by density = Kepler 22b
The Milky Way is not a planet. It is a galaxy.
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
Eris is not a planet in the Milky Way galaxy; it is a dwarf planet located in the outer solar system. It is the most massive dwarf planet known to exist and is part of the Kuiper Belt, a region beyond Neptune that is home to many icy bodies.
The 'Milky Way' refers to a galaxy, not a planet.
the planet earth is in our Galaxy The milky way
Our planet is located in the Milky Way Galaxy.
Milky way itself a galaxy.there are hundreds of thousands galaxy there.
Milky Way
No. Although the Milky Way is a relatively large galaxy it is nowhere near the largest known. Galaxies dozens of times the size and hundreds of times the mass of the Milky Way have been observed.
The Milky Way is a Galaxy, not a planet
There are approximately 200 to 400 billion stars in our galaxy. Milky Way is one of the biggest known galaxies.
No. The Milky Way is larger than average, but it is nowhere near the largest.