Sentences with phrase «produce narrow rings»

«All we need to produce narrow rings and other structures in our models of debris disks is a bit of gas, too little for us to detect today in most actual systems,» said co-author Marc Kuchner, an astrophysicist at NASA's Goddard Space Flight Center in Greenbelt, Md..

Not exact matches

Where the limiting resource for growth is moisture, the drier years will produce exceedingly narrow growth rings — less than a tenth of the thickness of a sheet of paper — and the wetter years will produce fatter ones.

In warm years, trees tend to produce wider, denser rings and in cool years, the rings are typically narrower and less dense.

Because some species respond predictably by producing narrower annual rings when rainfall declines, the researchers were able to plot precipitation year by year from the 1500s on.