Ground Report

An international team of astronomers peering into the deep universe said on Thursday that they had mapped the biggest-ever structure of the enigmatic substance known as dark matter.They detected a web of matter spanning 270 million light years,or more than 2,000 times the size of our own galaxy,the Milky Way,they said.The team drew up the map from images provided by the Canada-France-Hawaii telescope located in Hawaii.Their technique is based on gravitational lensing under which light from distant galaxies is deflected by dark matter as it travels through the cosmos to us.