The Advanced Camera for Surveys (ACS) is a scientific instrument aboard the Hubble Space Telescope (HST). It was installed during Servicing Mission 3B in 2002, and it replaced the original Wide Field Planetary Camera 2 (WFPC2). The ACS provides high-resolution imaging and spectroscopy capabilities, making it one of the most powerful and versatile cameras ever placed in orbit.
The ACS has a field of view that is about three times wider than the WFPC2, and its advanced technology allows it to capture images with much greater detail and sensitivity. Some of the key science goals for the ACS include studying the evolution of galaxies, observing distant supernovae, searching for dark matter and dark energy, and characterizing the populations of stars and planetary systems in our own Milky Way.
Since its installation, the ACS has made many important scientific contributions, including the discovery of the accelerated expansion of the universe, the identification of the first exoplanet transits, and the creation of detailed maps of the distribution of dark matter in galaxies. The ACS continues to play a vital role in our understanding of the universe and its evolution.