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Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye
The Tasmanian devil's whiskers help them to locate prey in the dark.
Amsterdam Albatross - Adult in flight, showing dark plumage typical of the species.
The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star
Mapping Dark Matter
Structural MRIs reveal cortical loss in adolescent patients with schizophrenia. Here dark blue ...