New Moon at Saturn Discovered

I knew it. The Pluto debate was only the beginning.

The way things are going soon we will be having detailed discussions about when a pebble becomes a rock, when a rock becomes a stone, then a boulder etc.

When does a hill become a mountain I wonder?

All semantic nonsense.

Peter.

Hi,

Although it is necessarily arbitrary we could adopt 100m as the dividing line between a moon and a orbiting rock.

The same is done with asteroids and meteoroids.

John

Good clear table of basic, up-to-date satellite stats here .
The scale picture on this wiki page is quite informative too!