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Alec Thomson et al.
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The universe got its most expansive MRI.
Astronomers created the biggest map ever of magnetic fields between stars and galaxies, using data from nearly 4 million galaxies collected by Australia’s ASKAP telescope. The survey is five times larger than all previous magnetic maps combined. This could answer a cosmic chicken-and-egg problem: Did magnetic fields help build the first galaxies, or did galaxies create the magnetic fields?
Think of it as night vision for one of the universe’s most invisible forces.
If you’re an astronomy nerd, the details are here.
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