Cirrus clouds form about 20,000 feet to 40,000 feet above Earth. Their appearance can indicate that a weather system, like a rain or snowstorm, is on the way. In general a moon halo usually means ...

Here's when to spot a lunar halo in the night sky Although ... the sun or moon means rain or snow is coming soon. This superstition isn’t far wrong, since cirrus and cirrostratus clouds are ...

NASA's Curiosity rover has captured images of rainbow-colored noctilucent clouds in Mars' atmosphere. Made of dry ice, these ...