HST ACS

Explanation: The Advanced Camera for Surveys (ACS) became the primary imaging instrument aboard the Hubble Space Telescope after being installed during Servicing Mission 3B (STS-109) on March 7, 2002. The High-Resolution CHannel (HRC), responsible for our best-yet maps of Pluto, is currently disabled due to an electrical fault.

Pluto

Image credit: Wikipedia.