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  • Evidence of broadside collision with a dwarf galaxy discovered in the Milky Way

    ‘Shell structures,’ the result of a collision with another galaxy nearly 3 billion years, have been confirmed in the Milky Way galaxy for the first time.
    two spiral galaxies merging together
    Two spiral galaxies (from left) NGC 2207 and IC 2163 colliding with one another. As the two galaxies slowly tear each other apart, their stars are pulled by “tidal forces,” eventually forming a long cord of stars that will form a smooth, sharp curve around the galaxy. Evidence of this type of collision, known as a "shell structure," was recently found in the Milky Way, remnants of a collision that happened nearly 3 billion years ago. (Image credit: Debra Meloy Elmegreen (Vassar College) et al., & the Hubble Heritage Team (AURA/STScI/NASA))

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  • From a desert to an oasis: Penn engages in ambitious greening effort in the Sahel
    People gather around a large map placed on the floor.

    In Senegal, the ambitious Dakar Greenbelt project seeks to create an extensive network of ecological infrastructure in and around the city to sustainably address environmental concerns and enhance urban life. With support from David Gouverneur and Ellen Neises, Ph.D. candidate Rob Levinthal in the Weitzman School of Design led two courses that included a field trip to Dakar, that culminated in students presenting their visions for parts of the Greenbelt.

    (Image: Courtesy of Chaowu Li)

    From a desert to an oasis: Penn engages in ambitious greening effort in the Sahel

    Students from the Weitzman School of Design journeyed to Senegal to help with a massive ecological and infrastructural greening effort as part of their coursework. The Dakar Greenbelt aims to combat desertification and promote sustainable urban growth.

    Jan 31, 2025

    An illuminating celebration to a brighter, greener future
    The exterior of the Vagelos building lit up with dramatic lighting.

    The new Vagelos Laboratory for Energy Science and Technology boasts adaptable laboratory spaces to support the dynamic needs of pioneering research.

    nocred

    An illuminating celebration to a brighter, greener future

    Members of the Penn community celebrated an energy research milestone: the unveiling of the new Vagelos Laboratory for Energy Science and Technology.

    Dec 12, 2024