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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.
In 2021, evidence for a probable impact 3.46 billion-years ago at Pilbara Craton has been found in the form of a 150 kilometres (93 mi) crater created by the impact of a 10 kilometres (6.2 mi) asteroid (named "The Apex Asteroid") into the sea at a depth of 2.5 kilometres (1.6 mi) (near the site of Marble Bar, Western Australia). [52]
Astronomers think the collision between Earth and Theia happened at about 4.4 to 4.45 billion years ago ; about 0.1 billion years after the Solar System began to form. [15] [16] In astronomical terms, the impact would have been of moderate velocity. Theia is thought to have struck Earth at an oblique angle when Earth was nearly fully formed.
But dinosaurs were still a long time away from roaming Earth when S2 crashed down about 3.26 billion years ago. The meteorite was estimated to have been up to 200 times larger than the extinction ...
The meteorite, S2, was first discovered in 2014. It hit the planet about 3.26 billion years ago and is estimated to have been up to 200 times larger than the space rock that later killed the ...
In September Nasa’s Osiris-Rex safely brought samples from asteroid Bennu to Earth. 4.5 billion-year-old asteroid could reveal the origins of life on Earth Skip to main content
The estimated end of the Sun's current phase of development, after which it will swell into a red giant, either scorching or swallowing Earth, will occur around five billion years from now. However, as the Sun grows gradually hotter (over millions of years), Earth may become too hot for life as early as one billion years from now. [207] [208] [209]
When a meteorite with the mass of four Mount Everests hit Earth 3.2 billion years ago, it caused global chaos and provided an unexpected silver lining for life.