By Jonathan Amos
Science correspondent, BBC News, Paris
The Planck space telescope has identified some of the largest structures ever seen in the Universe.
These are clusters of galaxies that are gravitationally bound to each other and which measure tens of millions of light-years across.
Astronomers say the Planck observatory has made more than 20 detections that are brand new to science.
The European Space Agency telescope has also confirmed the existence of a further 169 galaxy clusters.
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"The clusters contain up to a hundred galaxies, and each galaxy has a billion stars," said Dr Nabila Aghanim of the Institut d'Astrophysique Spatiale in Orsay, France.
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more:
http://www.bbc.co.uk/news/science-environment-12139982