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NASA Satellite Reveals Fall Colors From Space
NASA Satellite Reveals Fall Colors From Space
Sep 21, 2024 1:35 AM

Satellite View of Fall Colors

NASA’s Terra satellite captured this view of fall colors around the Great Lakes on Sept. 26, 2014. (Jeff Schmaltz at NASA GSFC)

Of all the leaf peepers among us, the folks at NASA win. They have the best views and can take them all in at once.

These photos, taken by satellite last week. show the bands of reds and oranges around the Great Lakes.

(MORE: When Will Leaves Hit Peak Color In Your Area?)

Here's the scientists' explanation of the yearly phenomenon:

"A few days after autumn showed up on the calendar in the Northern Hemisphere, it showed up on the landscape of North America. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this view of fall colors around the Great Lakes on Sept. 26, 2014.

The changing of leaf color in temperate forests involves several causes and reactions, but the dominant factors are sunlight and heat. Since temperatures tend to drop sooner and sunlight fades faster at higher latitudes, the progression of fall color changes tends to move from north to south across North America from mid-September through mid-November.

In late summer and autumn, tree and plant leaves produce less chlorophyll, the green pigment that harvests sunlight for plants to convert water and carbon dioxide into sugars. The subsidence of chlorophyll allows other chemical compounds in the leaves—particularly carotenoids and flavonoids—to emerge from the green shadow of summer. These compounds do not decay as fast as chlorophyll, so they shine through in yellows, oranges, and reds as the green fades. Another set of chemicals, anthocyanins, are associated with the storage of sugars and give the leaves of some species deep purple and red hues."

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