<blockquote><font class="small">In reply to:</font><hr /><p>Well, calling our planet Terra would be a bit unnecessary I think (even though I would love to call our species Terrans), because Earth is as good a name as any.<p><hr /></p></p></blockquote><br /><br />Well, strictly speaking, if you look at the etymology of it "Earth" really means "the world". We live on a world called World! Terra does too, really. When the words first arose, there was no conception of this planet as a tiny place in a vast cosmos of other worlds. Earth was the world where mortals lived. Above it was Heaven, and below it was Hell. (There are many variations on this theme, but they do tend to regard Earth as basically the world accessible to humans and didn't even seriously consider the possiblity of people leaving it.) Earth also means dirt. The etymology is very tightly connected; the name of our planet means it is the material world. Planets like Mars and Jupiter were not believed to be worlds; they therefore could not have earth of their own. Some believed them to be gods, others just saw them as lanterns set in the sky. They were movable lanterns -- hence, "planets".<br /><br />It is very important to know that we don't call Earth "Planet" because at the time the words arose, planets were not known to be actual worlds. Planets were wandering stars, points of light that moved through the heavens. Even the Moon was not believed to be anything like Earth, even though you can *see* its features with the unaided eye; Galileo actually got in trouble with the Church for saying that he could see mountains on the Moon.<br /><br />So if you object to calling the Moon "Moon", you must also object to calling Earth "Earth". <img src="/images/icons/wink.gif" /><br /><br />Many astronomers do use the name "Luna", and of course it has different names in different languages. (Romance languages do use variations on "Luna", which is of course the Roman name for it.) The Greek name for it, Selene, also comes u <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>