Finally, a few more specs are detailed in the hope of enticing tech-minded shoppers, with reference to a Snapdragon S4 processor, a 1, 800mAh battery and a 356 pixel density that tallies with what we've already seen of the 4.2-inch 720p screen.

ENGADGET: Leaked BB 10 sales training manual reveals a few more specs, promises 70K apps at launch

And that geometrical prediction was confirmed directly by the Sloan survey, using the known distances of 500m light years to the density peak and 13 billion light years to the region where the microwave background originates as reference points to look for geometrical distortion, in the way that a more traditional land survey might use triangulation points.

ECONOMIST: Astronomy