# How much water Earth can hold?

What would happen if we keep adding water to Earth? Earth would become massive, more surface area, and it can hold more water. Finally, would it collapse to a blackhole, or somehow water would be spilled into space?

• Comments are not for extended discussion; this conversation has been moved to chat. – David Z Sep 3 '16 at 15:52

Once it reaches 65-350 $M_♃$ (Jupiter masses), so the earth bit is already a tiny dot in this huge ellipsoid, the earth doesn't matter now), if there is enough deuterium, it will start fusing deuterium, so it can technically be considered a brown dwarf.
After 350 $M_♃$, the heat produced by gravity should be enough to decompose enough water to the point it is able to sustain fusion and become a brown dwarf
After 1.5 $M_☉$ (solar masses) or 1500 $M_♃$, it will be able to start being a main sequence star.