Where in the universe did the Big Bang take place? a. near the Milky Way Galaxy

Question

Where in the universe did the Big Bang take place? a. near the Milky Way Galaxy near the Virgo cluster c. near some unknown location on the other side of the universe d. everywhere in the universe e. at the center of the universe, not too far from the center of the cosmic background radiation Hubble's law is written in a mathematical form as a. v times D = H_0. b. v times D = 1/H_0. c. v = H_0 times D d. v times H_0 = D. e. D/v = H_0 Is dark energy responsible for the expansion of the universe? a. No. The expansion would happen without dark energy, but dark energy is causing the expansion rate to decrease. b. Yes, Dark energy is currently the driving force in the universe's expansion c. No. Dark energy is only responsible for the observed rapid motions of stars within galaxies. d. No. The expansion would happen without dark energy, but dark energy is causing the expansion rate to increase. e. No. The dark energy has no effect on the expansion. Which of the following are changing as the universe is expanding? a. the laws of physics b. the sizes of atoms c. the sizes of planetary systems d. the cosmological distances e. the diameters of stars and galaxies Which of the following is not a prediction of the standard Big Bang theory that has been successfully verified by observations. a. The universe is expanding. b. The most distant galaxies are redder because they are older. c. Helium and lithium were made as the universe cooled after the initial Big Bang. d. The early universe was very hot and dense. e The most distant galaxies are redder because their light has been stretched during the time it took for the light to reach Earth. In the early 1960s, physicists Penzias and Wilson detected a persistent noise at a wavelength of about 1 mm in their radio telescope that came from all directions in the sky due to a. synchrotron emission from the Crab Nebula. b. emission from newly formed stars in the Orion Nebula. c. cellphone usage.

Explanation / Answer

14. (c) unknown location of other side of universe.

15. The dominant motion in the universe is the smooth expansion known as Hubble's Law.

Recessional Velocity = Hubble's constant times distance

V = Ho D

where

V is the observed velocity of the galaxy away from us, usually in km/sec

H is Hubble's "constant", in km/sec/Mpc

D is the distance to the galaxy in Mpc

16. B

Yes, the dark energy responsible for the expansion of universe. Ordinary matter acts to slow down the expansion of the universe. That makes intuitive sense, because the matter is exerting a gravitational force, acting to pull things together. The dark energy has “negative pressure.” The kind of pressure we are most familiar with, in a balloon or an inflated tire, pushing out on the membrane enclosing it. But negative pressure — tension — is more like a stretched string or rubber band, pulling in rather than pushing out. And dark energy has negative pressure, so that makes the universe accelerate.

17. D. the cosmological distances.

Explanation:- The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest. This means that no matter what galaxy you happen to be in, all the other galaxies are moving away from you.

18. d

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