Space.com #Earth Vulnerable to Major Asteroid Strike, White House Science Chief Says 14 September 2016 fborgosano Leave a comment Share: NASA has made a great deal of progress in finding the asteroids that pose the biggest threat to Earth, but there’s still a lot of work to do, said John Holdren, director of the White House’s Office of Science and Technology Policy. from Space.com ift.tt/2c9iyIh Share: