'Milky Way saw massive explosion 6 mn-years-ago'
A recent study revealed the Milky Way witnessed a "massive" explosion six million-years-ago, when the first human ancestors, hominins, walked the Earth. It led to the formation of a void area at the galaxy's center, extending two-thirds of the way to Earth. The explosion saw some gasses move towards the centre, with other gasses being pumped out at 1,000 km/sec.