 | It has been suggested that this article be merged into Giant-impact hypothesis. (Discuss) Proposed since October 2024. |
&sq=&lang=&file=File:Artist%27s_concept_of_collision_at_HD_172555.jpg) An artist's depiction of the hypothetical planet impacting the Early Earth. | |
| Designations | |
|---|---|
| Pronunciation | /ˈθiːə/ |
| Symbol | &sq=&lang=&file=File:Theia_symbol_(fixed_width).svg){kind=small} |
| Orbital characteristics | |
| Star | Sun |
| Physical characteristics | |
| 1.4437×108 km2 (0.284 Earths) | |
| Mass | 0.1 - 0.45 M🜨 |
Theia (/ˈθiːə/) is a hypothesized ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris coalescing to form the Moon.[1][2] Collision simulations support the idea that the large low-shear-velocity provinces in the lower mantle may be remnants of Theia.[3][4] Theia is hypothesized to have been about the size of Mars, and may have formed in the outer Solar System and provided much of Earth's water, though this is debated.[5]
- ^ Cite error: The named reference
agerefinementwas invoked but never defined (see the help page). - ^ Cite error: The named reference
TheiaPothesiswas invoked but never defined (see the help page). - ^ Sample, Ian (November 1, 2023). "Blobs near Earth's core are remnants of collision with another planet, study says". The Guardian.
- ^ Cite error: The named reference
NYT-20231101was invoked but never defined (see the help page). - ^ Meier, M.M.M.; Reufer, A.; Wieler, R. (November 2014). "On the origin and composition of Theia: Constraints from new models of the Giant Impact". Icarus. 242: 316–328. arXiv:1410.3819. Bibcode:2014Icar..242..316M. doi:10.1016/j.icarus.2014.08.003. ISSN 0019-1035.