Science When a gravitational lens magnifies a background galaxy, why don’t we see the object doing the lensing, as we would if looking through an optical lens?
Science Can we turn Minuteman missiles into cheap launchers to deliver small payloads to the Moon and Earth-passing asteroids?
Stars If neutron stars don’t produce energy from fusion, like normal stars, how can they shine in visible light?
Science If we lived on a planet circling a star about to go supernova, would we know it was going to happen?
Science When will search programs find more than 90 percent of near-Earth objects? What scopes monitor skies in the Southern Hemisphere? Who funds the searches?
