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  1. Physics

    Uranium ‘snowflakes’ could set off thermonuclear explosions of dead stars

    Uranium crystals that settle in the cores of white dwarfs could trigger nuclear chain reactions that blow the dead stars apart, a new study suggests.

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  2. Astronomy

    Here’s why humans chose particular groups of stars as constellations

    Distances between stars, their brightnesses and patterns of human eye movement explain why particular sets of stars tend to be grouped together.

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  3. Ecosystems

    How kelp forests off California are responding to an urchin takeover

    A pair of studies reports 95 percent loss of kelp forests along the northern coast while sea otters are helping maintain surviving kelp farther south.