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Astronomers spot a perfectly straight 'iron bar' inside the Ring Nebula — and no one knows why

Astronomers have found a strange “iron bar” inside the Ring Nebula, a cloud of gas about 2,283 light-years away. The long, ...
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Destroyed planet? Giant iron bar found in the Ring Nebula may be a vaporized planet

Finding such a large concentration of iron in this precise shape is difficult to explain using existing models of how ...