Transcript of President Obama's Call to the International Space Station (with video)

"President Obama: Well, this mission marks the final flight of the Space Shuttle Program and also ushers in an exciting new era, to push the frontiers of space exploration and human spaceflight. You guys will continue to operate, or crew members like you will continue to operate the ISS in coming years, and seek to use it to advance scientific research and technology development. I've tasked NASA with an ambitious new mission to develop the systems and space technologies that are going to be necessary to conduct exploration beyond Earth, and ultimately sending humans to Mars, which is obviously no small feat, but I know we're going to be up to the task."