Why do Earth’s hemispheres look equally bright when viewed from space?

Tallbloke's Talkshop

Has the mystery been solved?
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When looking at the Earth from space, its hemispheres – northern and southern – appear equally bright, says EurekAlert.

This is particularly unexpected because the Southern Hemisphere is mostly covered with dark oceans, whereas the Northern Hemisphere has a vast land area that is much brighter than these oceans.

For years, the brightness symmetry between hemispheres remained a mystery.

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