Final answer:
Mass spectrometry has been used to investigate the composition of a. Jupiter's moon Europa and Saturn's moon Titan. It has also been used to study objects such as Pluto and its moon Charon.
Step-by-step explanation:
Mass spectrometry has been used to investigate various astronomical entities in addition to the Moon and Mars. For example, mass spectrometry has been used to study the composition of Jupiter's moon Europa. Europa is of particular interest because it is believed to have a global ocean of liquid water beneath its icy crust, which could potentially support life.
Saturn's moon Titan has also been investigated using mass spectrometry. Titan has a thick atmosphere mostly composed of nitrogen, with trace amounts of methane and other organic compounds. Mass spectrometry has helped scientists analyze the composition of Titan's atmosphere and surface.
In addition to moons, mass spectrometry has also been used to study other objects in the solar system such as Pluto and its moon Charon. The New Horizons spacecraft provided valuable data on the composition of these objects, including the presence of nitrogen ice and other fascinating features.