A massive rocket carrying a spy satellite for the US government launched from the California coast on Wednesday. The Delta IV Heavy rocket left the launch pad at Vandenberg Air Force Base and sped towards low-Earth orbit, officials said. The rocket carried a satellite for the National Reconnaissance Office, which oversees the USA's constellation of intelligence-gathering satellites. At 23 stories, the Delta IV Heavy is the largest rocket in the country. The last time it launched from Vandenberg - in 2011, the roar of the engines shook the nearby city of Lompoc. Some people reported hearing the engine roar from...