has spotted a tree that is out of this world.The American space agency shared a stunning image of the 'Christmas Tree Cluster' - a massive cluster of young stars 2,500 light-years from Earth.The photograph was created to look like a holiday tree, using blue and white to colorize the young stars that are no more than five million years old - most luminous spheres of plasma are between 1 billion and 10 billion years old.
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