4.5 billion years ago: Mercury, Venus, Earth, and Mars form. A Mars-sized planet collides with Earth, and the debris forms the Moon. 4.5 to 4.1 billion years ago: The Sun gravitationally separates from its protostar siblings. 4.1 to 3.8 billion years ago: The giant planets' orbits shift, scattering small worlds throughout the solar system.
4.59 billion years ago: The giant planets Jupiter, Saturn, Uranus, and Neptune form around the protosun. At least Uranus and Neptune form closer to the Sun than where they are today. One or more ice giants may have also formed that were later ejected from the solar system.
4.6 billion years ago: A group of protostars, one of which will become the Sun, form from a cloud of debris left by prior star explosions in the Milky Way. 4.59 billion years ago: The giant planets Jupiter, Saturn, Uranus, and Neptune form around the protosun. At least Uranus and Neptune form closer to the Sun than where they are today.
A Planet Slammed Into Earth 4.5 Billion Years Ago, Forming the Moon. The Projectile May Have Been Our Neighbor A Planet Slammed Into Earth 4.5 Billion Years Ago, Forming the Moon. The Projectile May Have Been Our Neighbor Little is known about the long-destroyed moon-forming planet, Theia.
Scientists have discovered extremely rare remnants of “proto Earth,” which formed about 4.5 billion years ago, before a colossal impact irreversibly altered the primitive planet''s composition
Learn about the history of Earth from its formation to the present day, with major events and periods. See how life evolved, continents
Roughly 4.5 billion years ago, a Mars-sized protoplanet named Theia slammed into the young Earth, causing a massive cataclysm that reshaped the very structure of the planet. This was a
Roughly six years ago, an international team of planetary scientists—mostly from the US and China—shared what sounded like a blockbuster theory: Jupiter might have swallowed another
Around 4 billion years ago, our young inner solar system underwent a cataclysmic pummeling by asteroids that carved huge basins into Earth''s Moon. That''s the theory of the Late
Learn how the planets, asteroids, comets, and small worlds in our solar system formed and evolved over time. See key events from 13.8 billion
A Planet Slammed Into Earth 4.5 Billion Years Ago, Forming the Moon. The Projectile May Have Been Our Neighbor Little is known about the long-destroyed moon-forming planet, Theia.
4.1 to 3.8 billion years ago: The giant planets'' orbits shift, scattering small worlds throughout the solar system. Some bombard the inner planets and likely deliver water and organics
More than 4.5 billion years ago, long before human minds could contemplate time itself, a cloud of cosmic dust and gas swirled in the vastness of a young solar system. The remnants of
Around 4.4 billion years ago, our planet was still forming, and an ancient protoplanet named Theia was on a fateful path. The Giant-Impact Hypothesis suggests that Theia, a Mars-sized
Over 4.5 billion years ago, our solar system formed from a giant molecular cloud that collapsed under its own tremendous gravity. The hot stew of hydrogen and helium gave birth to our sun and flung out a
Scientists created a simulation showing that early Earth still retained chemical traces of its igneous youth, 4.5 billion years ago.
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