"The Cosmic Microwave Background, the most distant and detailed picture of the Universe, has been obtained by ESA's Planck mission."
The density of matter in the Universe was inhomogeneously distributed, implying that small amplitude density existed.
"As these fluctuations grow, the denser regions collapse to form the first bound objects."
The first dark matter haloes fragment, implying that the most massive galaxies may have formed in overdense regions.
Its unprecedented sensitivity will allow the community to identify and confirm bright galaxies spectroscopically.
At a redshift of z=7.66, they were able to identify a group of at least eight galaxies with similar colours.
This protocluster, known as SMACS0723 PC, is so far away that its light took 13 billion years to reach Earth.