Elon Musk, chief executive officer of Tesla Motors Inc. and Space Exploration Technologies Inc. known as Spacex, speaks at a news conference at the National Press Club in Washington, D.C., U.S., on Tuesday, April 5, 2011. Musk announced that SpaceX plans to build a new rocket called the Falcon Heavy that is capable of taking people or cargo to the International Space Station, the moon, or even Mars. The rocket would be ready for use by the end of 2012. Photographer: Brendan Hoffman/Bloomberg via Getty Images
