"Roaming" Magnetic Fields Found

Brian Handwerk

for National Geographic News

Published April 1, 2010 (corrected April 2, 2010)

Weak magnetic fields are “roaming” across the universe, according to a new study that may have solved the mystery of where the huge magnetic fields around galaxies come from.

Galaxies such as our Milky Way have their own large-scale magnetic fields. Although these fields are weak compared to planetary fields, scientists think the galactic versions help establish rates of star formation, guide cosmic rays, and regulate the dynamics of interstellar gas.

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