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Does anyone else watch 'Dr. Becky' on YouTube?

Her March 'Night Sky News' video, subtitled 'The biggest black hole burp, a wobbly Milky Way & Betelgeuse is brighter' says that...

"Dust and magnetic fields are the bane of astronomers".

Why? How do magnetic fields mess with astronomers' observations?

https://youtu.be/1cw2jJv3Wr8?t=565

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