theia definition: Proper noun 1. (astronomy) A Mars-sized object that may have collided with Earth to produce the moon. Learn more. Protoplanet, in astronomical theory, a hypothetical eddy in a whirling cloud of gas or dust that becomes a planet by condensation during formation of a solar system. The Difference Between astronomy and astrology If Theia, like Mars or main-belt asteroids, were made of different material than Earth, then a pre-lunar disk coming from Theia would lead to a Moon with a different composition than our planet.
See more. Astronomic definition, of, relating to, or connected with astronomy. (astronomy) A Mars-sized object that may have collided with Earth to produce the moon.Origin From Ancient Greek Θεία (Theia… Astronomy definition is - the study of objects and matter outside the earth's atmosphere and of their physical and chemical properties. (Greek mythology) A Titan, the sister-wife of Hyperion. 2.
astronomy meaning: 1. the scientific study of the universe and of objects that exist naturally in space, such as the…. As the central body, or protostar, of the system contracts and heats up, the increasing pressure of its radiation is believed to The giant-impact hypothesis, sometimes called the Big Splash, or the Theia Impact, suggests that Luna (the Moon) formed from the ejecta of a collision between the proto-Earth and a Mars-sized planetesimal, approximately 4.5 billion years ago, in the Hadean eon (about 20 to 100 million years after the Solar System coalesced).
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