![]() ![]() Astronomers, however, will still actively study the possibility of collapse until enough data is collected to accurately determine the density of the universe. With current data, it does not appear that the universe is dense enough on the whole to collapse. What this means will become more clear after studying the Big Bang and expanding universe, but in a nut shell, the critical density is the density that is needed in the universe to make it stop expanding and collapse on itself due to gravity. Density in kg/m 3: Earths atmosphere at sea level: 1.2: Water at standard temperature and pressure: 1,000: The Earth: 5,515. The last line in the table is the Critical density of the Universe. The molecular clouds are simply dust clouds which eventually break up and condense to form stars. This empty space becomes notable once the jump is made from the solar system to molecular clouds. This leaves quite a bit of empty space in the universe. Matter tends to clump together, even on the largest scales of the universe that we know today. Overall, students should begin to understand although we live in a place that is particularly dense, most of the universe is not like Earth. For more information on this subject, called dark matter, Universe is ten times greater than the mass we can see in the form of ![]() Of the explanation for this evidence that suggests the mass of the However, astronomers to this day are uncertain OtherĮvidence has suggested that this is a lower limit for the mass calculationįor most of the universe. ![]() Number of Water Molecules per cubic metric unitĬertain calculations have been made using only lower limits for massĬalculation, making the density calculations also lower limits. Average Densities of Objects in the Universe. To gain a better understanding of these densities, students can compare the number of water molecules in a cubic meter (or centimeter) for each density. Table 5 lists various estimates for densities throughout the universe. Begin with water, because it is a familiar substance and a useful metric for density. ![]()
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