The isotopic composition of meteorites and terrestrial planets holds important clues about
the earliest history of the Solar System and the processes of planet formation. Recent work …

The isotopic dichotomy between non-carbonaceous (NC) and carbonaceous (CC)
meteorites indicates that meteorite parent bodies derive from two genetically distinct …

As the search for Earth-like exoplanets gathers pace, in order to understand them, we need
comprehensive theories for how planetary atmospheres form and evolve. Written by two well …

Transient heating events that formed calcium-aluminum–rich inclusions (CAIs) and
chondrules are fundamental processes in the evolution of the solar protoplanetary disk, but …

The present-day 238U/235U ratio has fundamental implications for uranium-lead
geochronology and cosmochronology. A value of 137.88 has previously been considered …

Abstract Mixed 235 U–233 U–205 Pb (–202 Pb) tracers for U–Pb isotope-dilution isotope
ratio mass spectrometry have been prepared under the auspices of the EARTHTIME …

Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned
samples from asteroid Ryugu. Here we report results of oxygen isotope, mineralogical, and …

This review focuses on the rapidly growing field of natural 238U/235U variability, largely
driven by the technical advances in the measurement of U isotope ratios by mass …

Isotopic variations usually follow mass-dependent fractionation, meaning that the relative
variations in isotopic ratios scale with the difference in mass of the isotopes involved (eg …

The most abundant components of primitive meteorites (chondrites) are millimeter-sized
glassy spherical chondrules formed by transient melting events in the solar protoplanetary …