<blockquote><font class="small">In reply to:</font><hr /><p>Minor trivial little technical problem with that: "What goes up must come down." So unless your garbage succeeds in achieving escape velocity...<p><hr /></p></p></blockquote><br /><br />Two points:<br /><br />1) It won't come back in if we raise its perigee sufficiently. <img src="/images/icons/wink.gif" /> Ulysses, for instance, orbits at about the distance of Jupiter. It never returns to the inner solar system.<br /><br />2) Escape velocity actually isn't that much of a problem; so far, five spacecraft have already achieved it! You just have to use gravity assists. Actually, in theory, with clever use of Lagrange points, moving stuff around the solar system may be a lot easier (provided you're not in a big hurry) than we tend to think. <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>