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  1. Astronomy

    An arc of galaxies 3 billion light-years long may challenge cosmology

    Dubbed “the Giant Arc,” the purported structure is much larger than expected in a cosmos where matter is thought to be evenly distributed.

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  2. Earth

    Scientists have found the origins of a mysterious, deadly flood in India

    A landslide of rock and ice caused the deadly flood that washed out two hydroelectric power plants in an Indian Himalayan state in February.

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  3. Life

    Cells cram DNA into the nucleus in two distinct ways

    Heat maps of cell nuclei show that some cells pack chromosomes that look like crumpled balls of paper, while others are neatly stacked.