Scientists are hot on the tail of one of nature's most elusive substances, the mysterious dark matter that is thought to make up the bulk of the universe. Many scientists think dark matter might even be hiding right under our noses here on Earth. Dark matter is especially tricky to find because of its dark nature. In fact, scientists don't know what it is. It doesn't emit or reflect any light, so the most powerful telescopes have no hope of spying it directly. It has been thought to exist since the 1970s based on observations of gravity's effects on large-scales, such as among and between galaxies – regular matter can't account for the amount of gravity at work. ARTICLE HERE http://news.yahoo.com/s/space/20100225/sc_space/elusivedarkmattermaybehiddenonearth THIS SO FUNNY, WHY WOULDN'T IT BE HERE ON EARTH SINCE IT IS THE UNIVERSE AND THE BUILDING BLOCKS OF IT.