Name given to the aggregates of matter from which the planets were born, after a slow process of growth.
According to the nebular hypothesis of the birth of the Solar System, in a primitive nebula of disk-shaped gases and dusts, the largest solid particles acted as centers of attention for the smallest.
The planetesimals gave life to the embryos which later developed the planets we see today in orbit around the Sun.
Currently, thanks to the Hubble Space Telescope and other abservatory have been able to discover and photograph various areas that, according to all indications, must be in full formation of planetesimals.
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