For example, they want to measure the planet's inventory of stable noble gases, such as xenon and krypton, which change little in abundance over billions of years and hold clues to planetary origins. (sciencemag.org)
The unanswered question, so far, has been the planetary origin of 2008 TC3 ureilites. (sciencedaily.com)
These simulations are based, in part, on how the planets in Earth's solar system coalesced, but it's unclear how common these types of planetary origins are. (sciencenews.org)