President Bush and a team of top advisers are plotting a new vision for NASA, one that could include sending astronauts beyond Earth orbit to the moon with an eventual eye on Mars. The president’s secretive review of U.S. space policy, prompted by the Feb. 1 Columbia tragedy that killed seven astronauts, also has looked at scaling back human spaceflight. However, the White House said Thursday not to expect any major announcement soon, dimming speculation that Bush might unveil a bold new vision for NASA on Dec. 17 during the celebration of the 100th anniversary of the Wright brothers first flight at Kitty Hawk, N.C.