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Research News
Physicists have long wondered what could hurl cosmic rays through space with energies millions of times higher than terrestrial particle accelerators can achieve. Now a clue may be emerging, from a gap that has appeared in the cosmic ray spectrum just below the highest energy events ever detected. In a separate report in this issue
(p. 1977), a group of physicists propose that the gap marks the upper energy limit of an astronomical source of cosmic rays, such as violent processes in other galaxies. Cosmic rays above the gap, say these physicists, may be the offspring of a more exotic source: primordial defects in the fabric of spacetime.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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