An observation of the red shift of galaxies suggests that the universe is
a.
expanding.
c.
reversing.
b.
contracting.
d.
stagnant.

An observation of the red shift of galaxies suggests that the universe is expanding. The answer is letter A. .  It means that bodies farther away from Earth were moving away faster. The Hubble’s constant is the ratio of distance to redshift equal to 170 kilometers per second per light year of distance.

c)as speed changes, wavelength and frequency change.

everything changes!

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19