Missing clue to galaxy cluster formation

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Herschel and Planck find missing clue to galaxy cluster formation

31 March 2015 By combining observations of the distant Universe made with ESA’s Herschel and Planck space observatories, cosmologists have discovered what could be the precursors of the vast clusters of galaxies that we see today.

Galaxies like our Milky Way with its 100 billion stars are usually not found in isolation. In the Universe today, 13.8 billion years after the Big Bang, many are in dense clusters of tens, hundreds or even thousands of galaxies.

However, these clusters have not always existed, and a key question in modern cosmology is how such massive structures assembled in the early Universe.

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