Have you seen noctilucent, or “night shining,” clouds?
These clouds can be seen for several hours after the sun has set. They form in the summer at high latitudes, but they are getting denser and appearing farther south. The shine at night because they are 50 miles above the ground and reflect the sun’s rays hours after the sun has disappeared on the ground. They are still above the Earth’s curve.
They are made of ice particles and might be increasing because of the build up of carbon dioxide and the warming lower atmosphere which might have caused the stratosphere to get even colder. However, this hasn’t been proven.
At any rate, have you seen them while camping or whatever?
Pictures: “Night Shining” Clouds Getting Brighter. National Geographic News.
