hydrofix writes "A thin band of antiprotons enveloping the Earth has been spotted for the first time. The find, described in Astrophysical Journal Letters [arXiv] (Note: abstract free, full text paywalled), confirms theoretical work that predicted the Earth's magnetic field could trap antimatter. The antiprotons were spotted by the Pamela satellite launched in 2006 to study the nature of high-energy particles from the Sun and cosmic rays. Aside from confirming theoretical work that had long predicted the existence of these antimatter bands, the particles could also prove to be a novel fuel source for future spacecraft — an idea explored in a report for NASA's Institute for Advanced Concepts."
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