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Theia (/ ˈ θ iː ə /) 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.
And still, the calculations lined up: If Theia were a certain size and consistency, and struck the Earth at a specific speed, the models showed it could, in fact, leave behind massive hunks of its ...
[2] [14] According to modern theories of planet formation, Theia was part of a population of Mars-sized bodies that existed in the Solar System 4.5 billion years ago. One of the attractive features of the giant-impact hypothesis is that the formation of the Moon and Earth align; during the course of its formation, Earth is thought to have ...
Theia or Orpheus, [21] a Mars-sized impactor believed to have collided with the Earth roughly 4.5 billion years ago; an event which created the Moon. Evidence from 2019 suggests that it may have originated in the outer Solar System. [22] Vulcan, a hypothetical planet once believed to exist inside the orbit of Mercury. Initially proposed as the ...
The rings are believed to have been present approximately 466 million years ago. [1] [7] [8] The Hirnantian glaciation may be a direct result of the rings shielding light from reaching the Earth, [9] and the rings may have existed for up to 40 million years.
THEIA would use a 40-metre occulter to block starlight so as to directly image exoplanets. It was proposed with three main instruments and an occulter: [1]
“When Alex Trebek was still alive we never had any of this.” “I will NEVER watch Jeopardy after this. After Alex, it all went downhill,” another person sneered .
Theia is no less hypothetical than any of the others (opening line of the article: Theia is a hypothesized ancient planet). This should be an uncontroversial move. -- 143.167.6.197 ( talk ) 09:41, 9 September 2019 (UTC) [ reply ]