The mystery at heart of Milky Way: Astronomers are still arguing after 70 years over mushroom clouds at centre of galaxy… so were they caused by exploding stars or a black hole swallowing a gas cloud? • The bizarre cloud were first spotted in the 1950s and called the North Polar Spur • Experts put forward several ideas including exploding stars but lacked evidence • Now new images may have helped solve the mystery at the centre of our galaxy
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