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Data from ESA's Gaia mission have allowed astronomers to make the surprise discovery of a large, distant star cluster
Called Gaia 1, it is a collection of stars known as an open cluster
Open clusters are families of stars that were all born at the same time
Gaia 1 contains enough matter to make several thousand stars similar to the Sun
Astronomers then use computers to count the number of stars in each patch of sky
This method of star counting dates back to the 18th century
Astronomers William Herschel and his sister Caroline used it to estimate the shape of our Galaxy
Data from ESA's Gaia mission have allowed astronomers to make the surprise discovery of a large, distant star cluster
Called Gaia 1, it is a collection of stars known as an open cluster
Open clusters are families of stars that were all born at the same time
Gaia 1 contains enough matter to make several thousand stars similar to the Sun
Astronomers then use computers to count the number of stars in each patch of sky
This method of star counting dates back to the 18th century
Astronomers William Herschel and his sister Caroline used it to estimate the shape of our Galaxy