The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by
a. using Hubble's law.
b. measuring Doppler shifts of different parts of the disk.
c. the steady state theory.
d. measuring Doppler shifts of different parts of the disk.
d
You might also like to view...
A circular loop of wire has its radius doubled in time ?t. A uniform magnetic field is at an angle of 60° to the plane of the coil, and the magnetic field halves its intensity in the same time interval ?t. During this interval, what happens to the flux through the coil?
a. It decreases. b. It remains the same. c. It increases. d. More information is needed to make this conclusion.
Which physical unit is the SI acceleration of gravity?
A) 40 km, SW B) 32 ft/s2 C) 9.8 m/s2 D) 186,000 mi E) -120 mi/s
What simple observation inspired Alfred Wegener's hypothesis of continental drift?
What will be an ideal response?
More massive stars are _________ luminous and __________ than less massive stars, thus they pulsate _____________
a. less, smaller, faster b. more, larger, slower c. more, larger, slower d. less, smaller, faster