How to find a star cluster
It's the perfect meeting of old and new. Astronomers have combined recent data from ESA's Gaia mission with a simple analysis technique from the 18th century to discover a massive star cluster that had previously escaped detection. Subsequent investigations are helping to reveal the star-forming history of our Galaxy, the Milky Way.
For more about this story see How do you find a star cluster? Easy, simply count the stars at http://sci.esa.int/gaia/how-to-find-a-star-cluster