CLOUDS: Noctilucent cloud season has begun. Sky watchers in northern
Europe are reporting tendrils of electric-blue creeping over the
horizon at sunset. These are noctilucent clouds (NLCs), seeded by
meteoroids at the edge of space. Typically, they appear in late May and
blossom in June and July. In recent years they have been sighted in the
USA as far south as Colorado and Utah.
Visit today's edition of
Spaceweather.com to learn more about NLCs and how to see them.