<p><br /> Astronomers have found a new 100km diameter Trojan asteroid near Neptune.<br /> </p><p><br /> Trojans are a type of asteroid found in space graveyards. They shed light on what the early Solar System was like.<br /> </p><p><br /> Scientists say up to 150 similar objects could await discovery in the same area.<br /> </p><p><br /> The new asteroid was discovered by Dr Scott Sheppard of the Carnegie Institution and Dr Chadwick Trujillo of the Gemini Observatory, Hawaii.<br /> </p><p><br /> Meanwhile Kevin Yates, a scientist at the National Space Centre in Leicester, spends his time monitoring "near-Earth objects" to see if our eventual obliteration by an asteroid hitting Earth can be prevented.<br /> </p><p><br /> Scientists believe that the massive six mile wide asteroids of the type that wiped out the dinosaurs only come around once every 100 million years.<br /> </p>
