Explain why the principle of homogeneity is an important aspect of the cosmological principle
What will be an ideal response?
The fact that the Universe is both isotropic and homogeneous leads to the cosmological principle, which says that any observer in any galaxy sees the same general properties for the Universe. The cosmological principle implies there are no special places in the Universe. What you see from the Milky Way Galaxy is typical of what all intelligent creatures see from their respective home galaxies. Furthermore, the cosmological principle states, in a new form, the idea that the Universe can have no center or edge.
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Both black and white road surfaces radiate energy. At midnight on a starry night the warmer road surface is the
A) black surface. B) white surface. C) neither, as no noticeable difference.
Which of the following statements about the moons of the jovian planets is true?
A) Most of the moons have the potato-like shapes of asteroids, but a few are large enough to be spherical in shape. B) Even the biggest moons are smaller than any of the planets or dwarf planets in our solar system. C) All of the moons are barren and essentially airless, like our own Moon. D) The moons are made almost entirely of rock and metal.
The bright object in this photo is a quasar (named 3C 273). According to current understanding, about how big is the source of the bright light?
A) about the size of our solar system B) about a million light-years across C) about the size of the central bulge of the Milky Way Galaxy (that is, about 10,000 light-years across) D) about 500 light-years across
Imagine a group of people standing in a circle. There are two ways that they can create a “wave”. One way is by placing the palms of their hands together. One person begins by pushing on the adjacent person's palm who, in turn, pushes on the next person's palm, etc. Another way is by adjacent people holding hands. One person lifts the other person's hand and then that person lifts the next
person's hand, etc. Which types of waves are represented by each case? 1.Both cases represent longitudinal waves. 2.The first case represents a transverse wave and the second case represents a longitudinal wave. 3.Both cases represent transverse waves. 4.The first case represents a longitudinal wave and the second case represents a transverse wave.