Three faint moons
A Hubble Space Telescope image taken in 2005 shows a bare-bones view of Pluto and three of its moons: Nix, Hydra, and Charon. At the time this image was taken, the two smaller moons were newly discovered and are visible as the two fainter dots to the right of Pluto and Charon (and the image doesn’t even capture Kerberos and Styx, two other moons found later). Charon was only discovered in 1978, nearly 40 years after Pluto, which should tell you how hard it is to understand something from over 3 billion miles away. Nix and Hydra are about 5,000 times fainter than Pluto and up to three times farther from the dwarf planet than Charon, according to NASA.
The New Horizons spacecraft captured this enhanced-color view of Pluto’s moon Charon in July 2015:
