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monarch butterflies

A HISTORY OF TRAVEL  Some monarch butterflies live in the tropics and stay put, but their ancestors were migratory North Americans, like these wintering in Mexico. 

Sagittarius B2

MOLECULAR FOG  Sagittarius B2, the bright orange-red region left of center in this radio-infrared image, is a cloud of dust and gas around 26,000 light-years from Earth. It may host complex chemicals that are fundamental to life.

FISH BABY TALK  Adult gray snappers make noises, and recordings now show that at night, young larvae still in open water make chirpier versions of the same sounds.

purple twilight

VOLCANIC AFTERGLOW  Particles blasted into the atmosphere by volcanoes can create foggy, colorful effects in the sky, such as this purple twilight that followed the 1991 eruption of Mount Pinatubo in the Philippines.

solar cell

FUEL FROM WATER  Hydrogen and oxygen gas bubble off water-splitting catalysts that are powered by low-cost solar cells.

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