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Phil Plait

Bad Astronomy

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Cassiopeia-supernova

Learn about the thermal light echo, observed by NASA, that causes intricate layers of interstellar gas and dust to emit an infrared glow. 

A Light Echo From a Supernova Has Illuminated Interstellar Gas and Dust

(Credit: Julio Mercader)
Selected stone tools from Engaji Nanyori


Selected-stone-tools-from-Engaji-Nanyori

Learn more about how Homo erectus may have adapted to dryer, arid conditions before Homo sapiens. 

How Early Humans Adapted to Harsh Desert Climates Over a Million Years Ago

Engraved with concentric circles and solar rays, Vasagård's “sun stones” may have been made and buried in response to a volcanic eruption. (Credit: National Museum of Denmark)

Sun Stones

Learn more about the sun stones, shale artifacts that were sacrificed at the Neolithic site of Vasagård after a volcanic eruption shaded the Sun.

To Survive Volcanic Winter, Stone-Age Europeans Sacrificed Sun Stones

Periodic Mug

Foucault's Pendulum

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Elements Flashcards

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