The mystery at heart of Milky Way: Astronomers stewing after years over clouds at centre of galaxy
The mystery at heart of Milky Way: Astronomers still stewing 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 … Read more