According to this story, when the solar system was just getting started, a Mars-size protoplanet named Theia slammed into the proto-Earth. With an impact velocity of somewhere around 20,000 mph ...

In this image, the proposed hit-and-run collision is simulated in 3D, shown about an hour after impact. A cut-away view shows the iron cores. Theia (or most of it) barely escapes, so a follow-on ...

Andrea Salinas, one of Oregon’s U.S. representatives, met with small business owners to discuss the impact of rising tariff ...

Caption MFM simulation of the canonical Moon-Forming giant impact. Here different colors trace different components of Gaia and Theia. The lower mantle of Gaia, denoted by the dashed circle with a ...