Q&A Hero

Science

Q: The Milky Way is considered to be an intermediately wound, barred spiral, which would be type ________ according to Hubble. A) E4 B) Sa C) SBb D) SBV E) B2S
Q: Compared to our own Galaxy, elliptical galaxies A) show more internal structure. B) have bluer stars. C) have more dust. D) have no arms, but a better defined disk. E) show no evidence of ongoing star formation.
Q: In this diagram, the galaxy at the left side is a(n) A) Seyfert. B) spiral. C) barred spiral. D) elliptical. E) irregular.
Q: The astronomer who originally classified galaxies into S, E, and Irr was A) William Herschel. B) Harlow Shapley. C) Henrietta Leavitt. D) Edwin Hubble. E) Carl Sagan.
Q: Which property is common to spiral galaxies? A) ongoing star formation and emission nebula in the arms B) ongoing star formation and emission nebula in the halo C) globular clusters in the nucleus D) open clusters in the halo E) very little internal structure
Q: The flattest of the ellipticals are class A) E0. B) SBO. C) E7. D) E9. E) SBF.
Q: A spherical galaxy, like M87, which looks like a monster globular cluster, is type A) S0. B) ES. C) E0. D) ES1. E) 0V.
Q: The black hole in the core of a Seyfert galaxy consumes the equivalent of hundreds of solar masses a day.
Q: The supermassive black holes that may be powering active galaxies emit only synchrotron radiation.
Q: Synchrotron radiation is the major source of energy for active galaxies.
Q: There is evidence that a collision between a spiral and an elliptical galaxy has produced a radio galaxy.
Q: Quasars are far enough away that we must take the relativistic redshift into account when calculating their age.
Q: Seyferts are irregular galaxies with very strong radio emission.
Q: As the name quasi-stellar radio sources implies, all quasars are strong radio sources.
Q: Seyferts have properties that lie between quasars and normal spiral galaxies.
Q: The lobes of radio galaxies are perpendicular to their plane of rotation.
Q: Centaurus A, with two large radio lobes, is an active galaxy.
Q: Seyferts are spirals with quasar-like nuclei.
Q: Centaurus A is the closest lobe radio galaxy, and may be a collision between a spiral and an elliptical galaxy.
Q: Nearby active galaxies, such as Centaurus A, are likely the mergers between colliding galaxies.
Q: The light output from some quasars varies in just a few hours.
Q: On average, active galaxies are rare and most are fairly distant from us.
Q: Radio galaxies emit only radio waves, and are not otherwise observable.
Q: Quasars appear to have very large red shifts, and are receding at nearly the speed of light.
Q: When observing a quasar, we are probably looking at a stage of evolution in the very early universe.
Q: Core-dominated radio galaxies and radio galaxies with lobes are very similar in reality; we view themfrom different angles, which accounts for their different appearances.
Q: Active galaxies emit most of their radiation as visible light.
Q: Seyfert galaxies are the only type that produces gravitational lensing.
Q: Quasars are the brightest objects in the universe.
Q: The central engine of an active galaxy is less than a parsec in diameter.
Q: Quasars can emit thousands of times as much energy as normal galaxies.
Q: The additional energy given off by active galaxies is because of their higher stellar density.
Q: Hubble found a direct relation between a galaxy's velocity and distance.
Q: Virtually all galaxies are moving away from the Milky Way.
Q: Space itself is expanding.
Q: While our Magellanic Clouds are irregulars, the companions to Andromeda are ellipticals.
Q: The closest other galaxy to our solar system is the Sagittarius Dwarf.
Q: M31 in Andromeda is a bigger version of our Galaxy, and the largest member of the Local Group.
Q: In the Local Group, most members are either dwarf ellipticals or spirals.
Q: Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies.
Q: The Tully-Fisher relation allows us to determine the distance to the most distant galaxies.
Q: The Virgo Cluster of galaxies is not much larger in size than the Local Group, but it does contain far more galaxies.
Q: Except for the Local Group, galaxies seem to be isolated and randomly in space.
Q: The Virgo Cluster of galaxies is smaller than the Local Group.
Q: As with our own Sun among the neighboring stars, most galaxies in the Local Group are smaller and dimmer than our own Milky Way.
Q: The Milky Way is smaller than most members of the Local Group.
Q: The Local Group of galaxies spans about 30 million light years in diameter.
Q: A Type Sa galaxy is a spiral with a large bulge and tightly wound arms.
Q: The most tightly wound spiral arms belong to Hubble's type Sa.
Q: Irregular galaxies, although small, have large star-forming (HII) regions and much ongoing star formation for their size.
Q: Type Sc are the dustiest and flattest of the galaxies.
Q: On average, elliptical galaxies are richer star forming regions than spirals.
Q: In Hubble's "tuning fork," spirals are on the parallel branches.
Q: Irregulars typically have very few blue stars.
Q: Irr II galaxies may be the result of a collision, or close encounter, of two normal galaxies.
Q: Most galaxies are spirals.
Q: There are more giant elliptical than dwarf galaxies.
Q: Among the ellipticals, E0 types look the most like huge globular star clusters.
Q: Unlike spirals, elliptical galaxies do not contain a flattened disk.
Q: Despite varying masses, all spiral galaxies look essentially the same.
Q: Compared to the spirals, elliptical galaxies tend to be more dusty.
Q: Explain how the central engine powers an active nucleus or quasar.
Q: On what basis are we sure that no quasar is lurking among the thousands of member galaxies in the Virgo Cluster, 18 Mpc distant?
Q: How does the light from active galaxies differ from that of a normal galaxy?
Q: How do bipolar jets relate to lobe radio galaxies?
Q: What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?
Q: How did Hubble use the cosmological redshift to determine distance?
Q: Why can the Tully-Fisher relation be used at greater distances than Cepheids?
Q: Explain what a standard candle is and how it could be used to determine a galaxy's distance.
Q: Discuss the population, size, and types of galaxies we find in our Local Group.
Q: Briefly describe how Hubble classified the galaxies visually.
Q: What are the Magellanic Clouds? What happened in the LMC in 1987?
Q: Contrast the two types of radio galaxies in structure.
Q: Quasar is short for what? Is this true of all of them?
Q: Relate Seyferts to spirals.
Q: Why do quasars die out over time?
Q: Why is it that the quasars we see represent a time when the universe was younger?
Q: Why do some radio galaxies appear to have lobes while some do not?
Q: How does Hubble's law relate cosmological redshift to distance?
Q: What is meant by a cosmological distance?
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