Approaching Comet Hartley2

At www.physorg.com/print207909976.html … the Deep Impact spacecraft has captured images of multiple jets emanating from the surface of comet Hartley2, switching on and off. The spacecraft was 5 million miles away from the comet when the images were taken and there is a small video which can be viewed simply by clicking on an arrow as a start up. Turn up the volume on your computer before doing so. Is cometary science about to change?