The Science Technology Gist Without the poorly understood invisible material, “radiation would have washed away galaxies,” she said. by Carlo Diokno
'In a Big Think presentation, Professor Randall says the abundant nonluminous material was essential to the creation of structures we see in the Universe today. Even without dark matter, structures including the Earth, the Sun and other stars and planets would have formed. But Professor Randall points out that “the actual size of the galaxies we see is only possible because dark matter was present.”
'About ten billion years before the formation of the Solar System, apparently including the Earth, many areas in the Universe were inhabited by monstrous galaxies that make hundreds or thousand of times more stars than what we observe today in the Milky Way. In the modern Universe, there aren’t any monstrous galaxies left, but some astronomers believe that these monstrous structures have matured into giant elliptical galaxies.
'Astronomers have theorized that these monstrous galaxies form in areas within the known universe where there are concentration of dark matter. But up until now, observing these galaxies has been a problem. Part of the problem, they say, is that monstrous galaxies that manufacture lots of stars are often obscured in dust, making them difficult to observe in visible light. Galaxies covered in dust emit strong radio waves with submillimeter wavelengths, but radio telescopes typically have not had the resolution needed to locate individual galaxies.'