earth

  • GeneralWhat causes strange green flashes at sunset and sunrise on Earth?

    What causes strange green flashes at sunset and sunrise on Earth?

    Here’s something you might remember from your high school earth science class. Sunlight, which appears pure white, is refracted or…

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  • GeneralA Salty 'Peanut' Asteroid Could Reveal Where Earth Got Its Water

    A Salty ‘Peanut’ Asteroid Could Reveal Where Earth Got Its Water

    The infamous “space peanut” is aptly salty: Tiny salt crystals have been found on peanut-shaped asteroids, suggesting that the solar…

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