Enormous ‘Swiss cheese’ bubble surrounding Earth mapped in incredible new images

An enormous, 1,000-light-year-wide “superbubble” surrounds our planet. Now, astronomers have made the first ever 3D map of its magnetic field.

The gigantic structure, known as the “Local Bubble,” is a hollow blob of diffuse, hot plasma enclosed by a shell of cold gas and dust along whose surface stars form. It is just one of numerous hollows found in the Milky Way — making our galaxy resemble an enormous slice of Swiss cheese.

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