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from article Precession of equinoxes
Motion of the Earth's axis of rotation.
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from article Cephalochordata
European lancelet (Branchiostoma lanceolatum). (After J. E. Webb, On the populations of Branchiostoma lanceolatum and their relations with the West African lancelets, Proc. Zool. Soc. Lond., 127:131, 1956)
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from article Rhinoceros
Black rhinoceros (Diceros bicornis). (Photo courtesy of Dr. Lloyd Glenn Ingles, copyright © California Academy of Sciences)
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from article Ferret
An endangered black-footed ferret (Mustela nigripes). (Photo copyright © Joseph Dougherty)
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from article Siphonostomatoida
Siphonostomatoida. (a) Representative siphonostomatoid mandible; (b) brachiform maxilla (after Z. Kabata, Parasitic Copepoda of British Fishes, vol. 152, Ray Society, London, 1979). (c) Representative female caligid; (d) female Pennella (after P. A.…
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from article Holothuroidea
Cucumaria, a representative holothurian.
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from article Holothuroidea
Holothurian anatomy.
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from article Cosmic background radiation
Timeline of the origin and evolution of the universe from a hot, dense state (left) to the current star-and galaxy-filled cosmos that arose over eons of the universe’s history and through today (right). The cosmic microwave background, labeled the…
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from article Cosmic background radiation
The most detailed map ever made of the cosmic microwave background, a snapshot of the universe at 380,000 years of age, obtained by the Planck spacecraft during its observing run from 2009 to 2013. Anisotropies—tiny temperature fluctuations—are…
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from article Cosmic background radiation
The 15-meter horn antenna at Bell Telephone Laboratories in Holmdel, New Jersey where the first detection of the cosmic microwave background was made. (Credit: NASA)
