Sentences with phrase «dark planetesimals»
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.
http://www.sciencemag.org/ Not exact matches
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.