The top 100 photographs taken from the Hubble telescope.
During spring in Denmark, at approximately one half an hour before sunset, flocks of more than a million European starlings (sturnus vulgaris) join in the incredible formations that look like flying schools of fish. This phenomenon is called Black Sun (in Denmark), and can be witnessed in early spring throughout the marshlands of western Denmark.
Look west 30 to 60 minutes after sunset when the Sun has dipped 6 to 16 degrees below the horizon. If you see luminous blue-white tendrils spreading across the sky, you’ve probably spotted a noctilucent cloud. Although noctilucent clouds appear most often at high latitudes–e.g. places like Scandinavia and Canada–they have been sighted as far south as Colorado, Utah and Virginia.
Want to know where you can rent or buy a human skeleton? The Evolution Store sells unique natural history collectibles usually seen only in Museums. These include framed butterflies and beetles, fossils, seashells, skulls and skeletons, medical models, and tribal art.