lect 20 part 1

lect 20 part 1 - Question91 A. B.clusters, (likesoap sud...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Galaxies are distributed through the universe in A. isolated clusters containing anywhere from a few dozen galaxies to thousands of galaxies B. clusters, which are grouped into linked Question 9 1 superclusters around huge voids (like soap sud) C. isolated superclusters, each of which contain dozens of clusters of galaxies D. a random scattering of small clusters of galaxies similar to the Local Group Whether a protogalaxy evolves into an spiral or elliptical galaxy depends on its A. temperature B. luminosity Question 9 2 C. mass D. Initial rate of star formation Which of the following is true about the nature of quasars? AQ u a s a r must be very small in size (like an individual star). B Q b ih i h Ll G Question 9 3 Quasars must be within the Local Group. CQ u a s a r s must be very luminous. DQ u a s a r s must be moving toward Earth with large radial velocities.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Radio lobes radiate synchrotron radiation. This indicates that At h e source of the radio energy is rotating rapidly. Bh i g h speed electrons are spiraling through a magnetic field. Question 9 4 Ct h e source of the radio jets must be a supernova. Dt h e central galaxy must be a giant elliptical galaxy. Which of the following provides scientists with evidence that the energy source of quasars must be relatively small (compared to the size of a galaxy)? AQ u a s a r s have high radial velocities. Question 9 5 BQ u a s a r s are very luminous. CQ u a s a r s are surrounded by quasar fuzz. DQ u a s a r s radiate huge amounts of energy. EQ u a s a r s brightness fluctuate rapidly. To what does the phrase “superluminal motion” refer? A. the motion of relativistic electrons in magnetic fields B. the apparent motion of jets of gas at speeds f h li h Question 9 6 faster than light C. the apparent motion of arcs of light caused by gravitational lensing D. the motion of galaxies at redshifts z > 1
Background image of page 2
3 Hubble's Law can be represented as a plot of what two parameters of galaxies?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/06/2011 for the course ASTR 113 taught by Professor Geller during the Spring '08 term at George Mason.

Page1 / 13

lect 20 part 1 - Question91 A. B.clusters, (likesoap sud...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online