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  1. Astronomy

    Bennu and Ryugu look like spinning tops and scientists want to know why

    The first high-resolution images of Bennu confirm that the asteroid looks very similar to the asteroid Ryugu.

    By Jennifer Leman
  2. Planetary Science

    New Horizons gears up for its close encounter with Ultima Thule

    On January 1, the New Horizons spacecraft will fly by Ultima Thule, the first small Kuiper Belt object ever to get a close visitor.

    By Lisa Grossman
  3. Earth

    Erosion has erased most of Earth’s impact craters. Here are the survivors

    Earth’s largest known impact crater measures 160 kilometers in diameter. The newest, yet to be confirmed, stretches a still-whopping 31 kilometers.