The adventurous journey of Spaceship Earth

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    Abstract

    During its worst climatic episodes, about 2300 million years ago and about 700 million years ago, the Earth was in deep freeze. Even tropical coastlines would have looked like this scene from Antarctica today, to judge from evidence of stones dropped by icebergs near the equator. The explanation is that our planet suff ered from the eff ects of close encounters between other galaxies and the Milky Way, which provoked enhanced star formation rates and intense cosmic radiation.
    Original languageEnglish
    Title of host publicationEngineering Challenges : energy, climate change & health
    EditorsCarsten Broder Hansen
    Place of PublicationKgs.Lyngby
    PublisherTechnical University of Denmark
    Publication date2009
    Pages160-169
    ISBN (Print)978-87-985544-4-8
    Publication statusPublished - 2009
    SeriesDTU research series

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