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" ... That means that the gravitationally bound structures that had formed by the time about 7-to-8 billion years had passed are it; from that point onwards, if anything wasn’t yet gravitationally bound, it never will be. Our galaxy groups and clusters today are already fixed; the Local Group will never merge with the Virgo Cluster, the Leo Group, and won’t even remain part of Laniakea, our so-called local supercluster. This is a race that’s already decided; the expansion won and gravity lost. As such, ... "
" ... This visualization of the Laniakea supercluster, which represents a collection of more than 100,000... [+] estimated galaxies spanning a volume of over 100 million light-years, shows the distribution of dark matter (shadowy purple) and individual galaxies (bright orange/yellow) together. Despite the relatively recent identification of Laniakea as the supercluster which contains the Milky Way and much more, it's not a gravitationally bound structure and will not hold together as the Universe continues to expand. ... "