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  1. Astronomy

    A meteorite’s pristine origins

    A rare, carbon-rich meteorite that fell into a frozen Canadian lake last year ranks as the most pristine of such specimens ever found.

    By Ron Cowen
  2. Astronomy

    Gravity’s lens: Finding a sextet of images

    Astronomers have for the first time found a gravitational lens in which the image of a distant galaxy has been split into six distinct images.

    By Ron Cowen
  3. Astronomy

    Gravity’s lens: Finding a dim cluster

    Relying solely on a gravitational mirage rather than visible images, astronomers have discovered a previously unknown cluster of galaxies and measured its distance from Earth.

    By Ron Cowen
  4. Earth

    Dust, the Thermostat

    Analyses suggest that dust has profound, complex, and far-reaching effects on the planet's climate.