Animation of collision between Earth (blue) and Theia (black), forming the Moon (red and gray). Bodies are not to scale. According to the giant impact hypothesis, Theia orbited the Sun, nearly along the orbit of the proto-Earth, by staying close to one or the other of the Sun-Earth system's two more stable Lagrangian points (i.e., either L 4 or ...

2021年3月23日 · Scientists have long agreed that the Moon formed when a protoplanet, called Theia, struck Earth in its infancy some 4.5 billion years ago. Now, a team of scientists has a provocative new proposal: Theia's remains can be found in two continent-size layers of rock buried deep in Earth's mantle.

The hypothesis suggests that the Early Earth collided with a Mars -sized protoplanet of the same orbit approximately 4.5 billion years ago in the early Hadean eon (about 20 to 100 million years after the Solar System coalesced), and the ejecta of …

2012年3月25日 · The isotopic homogeneity of this highly refractory element suggests that lunar material was derived from the proto-Earth mantle, an origin that could be explained by efficient impact ejection, by...

2023年11月1日 · A giant collision between the ancient protoplanet Theia and the proto-Earth about 4.5 billion years ago may have formed Earth’s Moon as well as two continent-sized regions — formally known as large low-velocity provinces — within Earth’s mantle, according to a research team led by Caltech scientists.

The Moon formed 4.5 Ga ago through a collision between proto-Earth and a planetesimal known as Theia. The compositional similarity of Earth and Moon puts tight limits on the isotopic contrast betwe...

2014年6月6日 · The Moon was probably formed by a catastrophic collision of the proto-Earth with a planetesimal named Theia. Most numerical models of this collision imply a higher portion of Theia in the Moon than...

2018年3月22日 · The giant impact theory for the formation of the Earth–Moon system proposes that a Mars-sized embryo collided with the proto-Earth and ejected material into an Earth-orbiting disk, which ...

Our solar system used to be a much more violent place, with proto-planets colliding in cataclysmic giant impacts that helped create the worlds we see today. We study these dramatic events with 3D smoothed particle hydrodynamics (SPH) simulations, at 100–1000 times higher resolution than the current standard using our newly developed code ...

2021年12月30日 · A new model demonstrates how the formation of annular structures in a protoplanetary disk can later produce planetary systems that reproduce both the orbital architecture and meteoritic isotope...