Sentences with phrase «between planetesimals»
«So the fact that we can still see these disks around a 10 - to 20 - million - year - old star means that the dust is being replenished by collisions between planetesimals.»
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In contrast to earlier observations the team did not observe dust that will later form into planets, but dust created in collisions between small planets of a few kilometres in size — objects called planetesimals that are similar to the asteroids and comets of the Solar System.
An image of the circumstellar dust disk around the young star HR4796A, which is thought to have been created by collisions between asteroids and planetesimals that were left over following the star's formation.