Aerojet Rocketdyne Holdings Inc (AJRD.N) submitted a $2 cash billion offer to buy United Launch Alliance (ULA), a satellite launch provider jointly held by Lockheed Martin Corp (LMT.N) and Boeing Co (BA.N), sources familiar with the matter said Tuesday, a deal that would further consolidate the space business. Aerojet Rocketdyne board member Warren Lichtenstein, the chairman and chief executive of Steel Partners LLC, approached ULA President Tory Bruno and senior Lockheed and Boeing executives about the bid in early August, the sources said.