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rare earth
Rare Earths, clockwise from top center: praseodymium, cerium, lanthanum, neodymium, samarium and gadolinium.
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Milky Way
Illustration of what the Milky Way Galaxy may look like to a distant observer.
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A photograph shows a close up of a wolf spider carrying an egg sac
A stock image of a wolf spider carrying an egg sac.
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A replica of the Endeavour sits in the water
In this file photo, the Endeavour, a replica of Captain James Cook's ship of discovery, lies at anchor in Botany Bay in Sydney, Australia.
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Artist's illustration of ultra-high-energy cosmic ray astronomy to clarify extremely energetic phenomena.
Artist's illustration of ultra-high-energy cosmic ray astronomy to clarify extremely energetic phenomena.
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A gray wolf, a bald eagle, and a grizzly bear
A gray wolf, a bald eagle, and a grizzly bear