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(Solved): Mark all true statements concerning cosmology. A. In the big-bang theory, the universe emerged from ...



Mark all true statements concerning cosmology.

A. In the big-bang theory, the universe emerged from a big explosion that occurred at a certain point in space many billions of years ago.


B. In the big-bang theory, the universe expands, occupying a volume where there was only a vacuum before.


C.Hubble's law states that the speed with which other galaxies move away from our galaxy is proportional to the distance of these galaxies. This law applies to any other galaxies, such as, for example, the Andromeda galaxy, our Milky Way's neighbor.


D.The Friedmann-Lemaître metric is a solution of the Einstein field equation where the “cosmological principle” is applied, which assumes that the universe is homogeneous and isotopic. This metric describes a universe that starts out in an extremely dense state and then immediately expands.


E. The cosmological constant term was later added by Einstein to his 1915 field equation with the intention of obtaining a stationary solution for the universe. It is said that he later regretted it, because he thought that if he had relied on the original field equation he would have been able to theoretically have predicted the expansion of the universe, prior to observations in this regard.


F. The cosmic microwave background consists mainly of microwaves coming from all directions in space and can be associated with a black body at a temperature of the order of 3 kelvin. Its cosmological origin fits the big-bang model, in which the universe expanded from an extremely dense and hot initial state.


G. The cosmic microwave background originated when the temperature of the universe was lower than 3×103 kelvin, allowing the formation of neutral atoms.


H.Einstein's field equation, with the inclusion of the cosmological constant term, allows the description of a universe in accelerated expansion.



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A. In the big-bang theory, the universe emerged from a big explosion that occurred at a certain point in space many billions of years ago.- TRUE B.In the big-bang theory, the universe expands, occupying a volume where there was only a vacuum before.
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