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noun

Protoplaneta

An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets

"The astronomers believe a protoplanet, about the size of our Moon, collided with another one billions of years ago, eventually forming the planet Earth. "

Los astrónomos creen que un protoplaneta, aproximadamente del tamaño de nuestra Luna, chocó con otro hace miles de millones de años, formando finalmente el planeta Tierra.

astronomy space science