Solar System.
Spacecraft Images Comet Target's Jets
Jet Propulsion Laboratory https://www.jpl.nasa.gov/ Nov. 1, 2010
The Deep Impact spacecraft's High- and Medium-Resolution Imagers (HRI and MRI) have captured multiple jets turning on and off while the spacecraft is 8 million kilometers (5 million miles) away from the comet. These movies, one from HRI and one from MRI, show the progression of two jets during a 16-hour time period.