ESA’s Gaia mission
Cosmic mystery deepens with conflicting measurements of Hubble constant
Cataclysmic collision re-shaped Milky Way in distant past
Gaia takes a fingerprint of the Large Magellanic Cloud
Gaia data pins down 1.7 billion suns in most detailed star catalogue ever
Making galactic history with first global age map of the Milky Way
Astronomers have created the first large-scale map that shows stellar ages in the Milky Way by determining the ages of nearly 100,000 red giant stars, at distances of up to 50,000 light-years from the galactic centre. Notably, the map confirms that our home galaxy has grown inside out: in the present epoch, most old stars can be found in the middle, more recently formed ones in the outskirts.