Could a terrestrial planet get as big as a gas giant?

[Plat]

Or is there a limit to how big rocky planets could get.

[Peter Wilson]

Sure, but it's hard to imagine a terrestrial planet that big without a massive atmosphere.

[Bearded One]

Related thread here. (http://www.bautforum.com/questions-answers/24573-solid-planet-mass.html)

[napolean]

of couse it could. with enougth matter.

[lpetrich]

Are you talking about mass or linear dimensions?

The mass of such a planet is limited only by the available materials.

However, the linear-dimension size is another story entirely. If the central pressure gets large enough to crush the atomic structure, then the object will reach the maximum size possible for its composition. Jupiter is about at that size for a hydrogen-helium object, and some rough estimates I've made suggest that that maximum size will be somewhat less for an object with terrestrial-planet composition.