Sentences with phrase «original planetesimals»

None of the approximately 750,000 known asteroids and comets in the Solar System is thought to have originated outside it, despite models of the formation of planetary systems suggesting that orbital migration of giant planets ejects a large fraction of the original planetesimals into interstellar space1.

While putting together these planetary puzzle pieces, the scientists also determined that the dark family's original planetesimals were no smaller than 35 kilometers across.

Identification of a primordial asteroid family constrains the original planetesimals population.

The resulting paper, «Identification of a primordial asteroid family constrains the original planetesimal population,» appears in the August 3, 2017, online edition of Science.

Not exact matches

By aggregating the sizes of the modern dark asteroids, researchers suggest the original dark planetesimals formed about 4 billion years ago, making this one of the oldest asteroid families in the main belt; most asteroid families are thought to have formed about 1 billion years ago.