Japan's Hayabusa2 probe set to 'fire a bullet' into an asteroid

During the touchdown, which will last just a few seconds, the unmanned probe will use a projector device to shoot the "bullet" into the asteroid, blowing up material from beneath the surface. If all goes successfully, the craft will then collect samples that would eventually be sent back to Earth. Thursday's attempt is the first of three such touchdowns planned. The spacecraft is expected to touch down on the space rock around 6 p.m. ET. The brief landing will be challenging, given the uneven and boulder-covered surface.