What if the brilliant halos and sun dogs that are familiar to winter skies here on Earth are also glinting unseen but ...

Noctilucent or night-shining clouds are rare, high-altitude clouds that glow with a blue, silvery hue at dusk or dawn when the sun shines on them from below the horizon. These ice clouds typically ...

Around this time, the sun never dips far below the horizon, leaving it well placed to illuminate the high-altitude icy particles as night settles in. Noctilucent clouds most commonly appear ...

The prefix “alto” (meaning “high”) helps distinguish mid-level clouds from their lower-level counterparts (such as altostratus vs stratus). NWS cloud chart. Click to expand to full-size.

The Reaper Is More and More Vulnerable The MQ-9 Reaper has increasingly fallen behind newer drone variants, however—and grown more susceptible to anti-air efforts from the ground.