If you "run the clock backwards" using the Friedmann equations, you can avoid a singularity; you just need the pressure and energy to behave in the right way when the Universe was very hot and dense. The catch is that "the right way" in this case means that ρ+3p<0; in other words, either the energy density or the pressure (or both) have to be negative. No conventional forms of matter are known that satisfy this inequality, so unless something really strange was going on in the early Universe, there must have been an initial singularity. (Or, more plausibly, there was a time in the early Universe where the spacetime curvature was sufficiently large that the laws of GR as we know them did not apply.)
Explanation:
sub-saharan africa's rural population
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Who used the theory of uniformitarianism to expand the age of the Earth?
Charles Lyell used the theory of uniformitarianism to expand the age of the Earth. His scheme provided the "extending time" obligatory so that biological evolution would have taken place.
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The inner core is the dense sphere of solid iron and nickle at the center of the earth.
Answer:
Use the map to answer the question. On a world map, countries with Proctor and Gamble facilities are shaded green. The largest sections of green on the map include North America, Australia, most of South America, most of Western Europe, several countries in Asia, and a few countries in Africa. Which of the following is a conclusion about this corporation that can be drawn from this map? A. This corporation promotes hierarchical diffusion from the United Kingdom, the United States, and China. B. This corporation relies on stimulus diffusion to expand its influence and profitability. C. This corporation’s resource acquisition is centered in North America. D. This corporation’s manufacturing operations affect all regions.
Explanation:
