Which of the following is a consequence of Hubble's Law?

A) the Big Bang

B) all galaxies are moving away from us equally fast

C) the more distant a galaxy is from us, the faster it moves away from us

D) the closer a galaxy is to us, the faster it moves away from us

E) more distant galaxies appear younger

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Trinidad TremblayLv2

7 Apr 2020

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The Doppler effect for light is exactly the same as it is for sound. Hubble discovered thatthings further away from us were moving away from us faster than things close to us. Infact, there is almost a linear relationship between distance and recessional velocity(Hubble’s Law). Astronomers now use the recessional velocity as a measure of thedistance an object is from us. If the speed of light is 3x10^8 m/sec, how fast mustsomething be moving away from us to have us observe a wavelength that is 20% greaterthan that emitted?

A few multiple choice questions im having trouble with...

1. If a star formation switched off in a spiral galaxy, whichpartof it would get fainter? Bulge, disk, halo, dark matter orglobularclusters?

2. What is the essential difference between formation of spiralandelliptical galaxies?
a. random motions of stars are larger in ellipticals?
b. spiral galaxies had a more recent tidal encounter withanothergalaxy?
c. ellipticals form stars before they collapse; spiral formstarsafter they collapse?
d. spiral galaxies rotate faster
e. ellipticals had a more recent violent encounter withanothergalaxy?

3. The temperature of the background radiation is almost the sameinall directions
a. this is suprising, because the radiation from oppositedirectionsin the sky is comming from places that are beyong eachothers lighttravel horizon
b. this is expected because the big bang was a veryhomogenousexplosion
c. this was a measurement error in early observationsnowdiscredited.
d. the statement is not true, the temperature shows alargefluctuation all over the sky
e. none

thanks in advance!!!

Im a little confused as to the choice of (1-Vrel/c) in part a) and (1+Vrel/c) in part b). The galaxy is moving away from Earth but at position A isnt it techinically moving towards Earth so why are we not using (1+Vrel/c) for part a) and (1-Vrel/c) for part b) where position B is moving away?

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