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We can’t see magnetic fields in space directly; instead, their presence is established via the polarization of light. The team were able to infer these fields by using the movements of stars provided by the Gaia observatory and the location of galactic dust revealed by the Planck Space Telescope.
We Live Inside A 1,000-Light-Year-Wide Bubble Whose Magnetism Has Been Mapped
The Local Bubble in which our Solar System sits has triggered major star formation at its edges, where newly-mapped magnetic fields are suspected of playing an important part.
www.iflscience.com