http://www.bbc.com/news/science-environment-35267571
Quote:Largest ever 'age map' traces galactic history
Quote:Astronomers have measured the age of 70,000 stars across the Milky Way and put the results into a galactic map.
It confirms what was already suspected about our galaxy's growth: it started in the middle and grew outward.
This can be seen in the abundance of old stars near the centre of the disc.