Ronny Z (57) said:

. . . matter can be created.

Well, duh. E=mc²

Pump in enough energy and you get matter. The LHC will be doing just this – if you collide protons with enough energy, you can get all kinds of amazing particles formed. However, they pretty much all decay away within microseconds (well, the long-lived ones last microseconds; the faster-decaying ones tend to decay in nanoseconds or picoseconds. But you get the idea).

However, there is simply no way that any planet is hot enough to do this. The amount of energy required to create millions of tons of matter (which is what would be required to make a planet get even a tiny bit bigger) is phenomenal. It has to come from somewhere, but there is no source of energy anywhere near the solar system that is adequate.

Ever hear of water. two gases combined makes matter.

Erm … ever hear of the three states of matter – gas, liquid, solid?

In your example, you are combining matter with matter to get … matter. Big deal. It doesn’t prove anything (except that water isn’t an element, but that’s irrelevant to your point).