text: Isotopic fingerprints are used to study the origin of materials in the Solar System.  For example, the Moons oxygen isotopic ratios seem to be essentially identical to Earths. Oxygen isotopic ratios, which may be measured very precisely, yield a unique and distinct signature for each Solar System body. Different oxygen isotopic signatures can indicate the origin of material ejected into space. The Moons titanium isotope ratio (Ti/Ti) appears close to the Earths (within 4 ppm). In 2013, a study was released that indicated water in lunar magma was indistinguishable from carbonaceous chondrites and nearly the same as Earth's, based on the composition of water isotopes.