In the darkest region of her soul, Mary knew she was responsible.

The light areas are probably ice, but the dark regions may be seas of hydrocarbons.

Panic started to climb out of a dark region in her head.

The goal was to produce the first detailed three-dimensional maps of the dark region.

Sometimes he could look directly down into one of them, to see darker, cooler regions far below.

The counterpart of the earth was what they knew as the dark regions.

He told in detail of his descent into the dark regions below.

They had not yet descended into the dark regions where the kelp played its light show.

Thus unseen he came at last to the dark region of Avathar.

It is the most detailed examination of this dark region made public to date.