There are a few reasons for that:<br /><br />1) Some of these "sounds" do not occur "real-time" -- they aren't really sounds, and so what you hear in a recording is really data that has been processed as sound. <br /><br />2) The data behind these sounds isn't usually being captured 24/7 real-time, but rather in small chunks as the researchers have an opportunity to use their instruments.<br /><br />3) There isn't much widespread interest; most of this stuff is collected for the benefit of pure science, not the edification of the general public. Many researchers are starting to see the value of releasing raw data to the public, but many still have to consider the downside to that -- if they release their data to the public before they can publish their findings, they risk giving it to a competitor who can then beat them to the punch.<br /><br />But there are live sounds. Mars Polar Lander was to have transmitted sounds live, had it survived its descent to the Martian surface. And then, of course, there's the best one of all, which two posters have already mentioned above -- radio static. Some of that static comes from the Sun. Some of it comes from Jupiter. Some of it comes from the galatic core. But a lot of it comes from the Cosmic Microwave Background -- the afterglow of the Big Bang. So mess around with the dial on your radio, and you'll hear live sounds from space. <img src="/images/icons/wink.gif" /> <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>