Theastronomersinterpreted the unexpectedly fast rotation of galaxies that there must be a largequantityof dark energy whosegravityis detectable yet invisible.What is a galaxy?Any system of stars plusinterstellarmaterial that makes up the cosmos is referred to as agalaxy. Such assemblages are common, and many of them are so massive that they hold tens of trillions of stars.A vast variety of galaxies, from dim, hazydwarfobjects to spectacularspiral-shaped giants, have been created by nature. Almost allgalaxiesseem to have formed shortly after the universe started, and they are everywhere in space, even at thefarthestlimits of the universe that can be seen by the most advanced telescopes.Themajorityof galaxies are found in clusters, many of which are further organized into clusters that span hundreds of billions oflight-years.Since there are almost empty spaces between these so-called super clusters, the universe's overall structure resembles a network of sheets or chains of galaxies.To know more aboutGalaxy:brainly.com/question/2905713#SPJ12...

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