Sentences with phrase «rocks at least the size»
That implies that planet formation in that disk was fairly far along, in the stage that involves rocks at least the size of asteroids.
http://discovermagazine.com/ Not exact matches
With the help of emerging data from older fossil and rock records, the new study estimated that this size - biased extinction started at least 125,000 years ago in Africa.
Astronomers believe large moonlets up to at least a half - mile in size may hide among the rings, which themselves are only about 30 feet thick; the taller vertical structures visible here could be ring material that «splashes» up when the fine particles of the rings collide with these moonlets, much as water at the sea's edge can splash up and over a rock.
Such dust belts typically contain a spectrum of rocks of different sizes, and the distribution of dust strongly suggests at least one Mars mass worth of rocks 10 meters (30 feet) wide or smaller and up to several Earth masses of material if larger rocks are present, which Lisse says is very plausible but more speculative.
«There were many others half this size, and they all must have traveled at least ninety miles from their parent rock.»
To get a sense of what's out there, have a look, too, at this mesmerizing animated graphic showing just how much space rock is floating around (of the size astronomers are currently tracking, at least):