Early Earth
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Early Earth, also known as Proto-Earth, is loosely defined as Earth in the first one billion years — or gigayear — of its geological history, from its initial formation in the young Solar System at ab
Artist's depiction of the collision between Proto-Earth and Theia
Artist impression of the Early Earth as a lava planet during the Hadean eon
Artist's impression of Archean Earth, showing an orange atmospheric haze, leading to the alternative description of the planet in that stage of its development as a "pale orange dot"
Theia (hypothetical planet)
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Theia is a hypothetical ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the proto-Earth around 4.50 billion years ago, with some of the resultin
Early Earth
…as the young Proto-Earth, a protoplanet of about 0.63 Earth masses, began clearing the neighborhood, including the early Moon-forming collision with Theia — a Mars-sized co-orbital planet likely perturbed from the L4 Lagrange point — around 0.032 Ga after formation of the Solar System, which resulted in…
Full Moon 2010