As GigaOm reports today, Yahoo is expanding its cloud initiatives, extending its reach into research territory. Initially available only to researchers at Carnegie Mellon University, Yahoo’s 4,000-core, 1.5-petabytes-of-storage M45 cluster is now available to their counterparts at the University of California at Berkeley, Cornell University and the University of Massachusetts at Amherst. Yahoo’s M45 cluster runs Hadoop, an open source distributed file system and parallel execution environment that enables its users to process massive amounts of data. Apache Hadoop is an open source project of the Apache Software Foundation, to which Yahoo engineers have been the primary contributors to date. Find out more at GigaOm.