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The Milky Way may have been shrunk down by ancient magnetic fields


Scientist

The Milky Way may have been shrunk down by ancient magnetic fields

By Jason Arunn Murugesu This dazzling infrared image from NASA’s Spitzer Space Telescope shows hundreds of thousands of stars crowded into the swirling core of our spiral Milky Way galaxyNASA/JPL-CaltechMagnetic fields present in the early universe may have shrunk the volume of our galaxy by nearly 30 per cent. These fields seem to concentrate matter…

The Milky Way may have been shrunk down by ancient magnetic fields

By Jason Arunn Murugesu

New Scientist Default Image

This dazzling infrared image from NASA’s Spitzer Space Telescope shows hundreds of thousands of stars crowded into the swirling core of our spiral Milky Way galaxy

NASA/JPL-Caltech

Magnetic fields present in the early universe may have shrunk the volume of our galaxy by nearly 30 per cent. These fields seem to concentrate matter in the centre of galaxies, which might help explain why some black holes in such locations grow so fast.

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Sergio Martin-Alvarez at the University of Cambridge and his colleagues simulated the effects of poorly understood primordial magnetic fields on galaxy formation.

Computer simulations of galaxy formation don’t …

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