From there, the map radiates outwards into space and time, from the present in our local area right back to 13.7 billion light-years away – i.e., 13.7 billion years ago.

A map of foliage patterns is here to help, offering a best-guess guide to when aspen, birch, larch and maple trees will turn vivid shades of gold, orange and crimson. The forecast produced by the ...