WASHINGTON Jan. 14 — President Bush beckoned the nation "forward into the universe" on Wednesday, outlining a costly new effort to return Americans to the moon as early as 2015 and use it as a waystation to Mars and beyond. Bush said he envisioned "a new foothold on the moon...and new journeys to the world beyond our own," underscoring a renewed commitment to manned spaceflight less than a year after the loss of the space shuttle Columbia and a crew of seven. In a speech delivered at NASA headquarters a few blocks from the White House, Bush unveiled a plan...