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Giant Space Bubbles

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Winston Smith's picture
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A scientist using NASA's Fermi Gamma-Ray Telescope has discovered two massive gas bubbles "stretching to the north and to the south of the centre of the Milky Way". Not really sure how they calculate north and south when the Earth isn't involved. It might perhaps be more accurate to say "on either side of the Milky Way".

At any rate, each bubble stretches 25,000 light-years in diameter. The image in the article below really helps to bring it home how huge these things are.