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What is true of galaxies at the larger redshifts compared to ones nearby?
They appear smaller & more irregular.
The first attempt to map the Galaxy via star counts was done by who?
William Herschel in the late eighteenth century.
Based on galactic rotation curves and cluster dynamics, we think dark matter ?
comprises over 90% of the entire mass of the universe.
You observe a spiral galaxy with a large central bulge and tightly wrapped arms. It would be classified as?
It is harder to map the structure of the Milky Way in visible wavelengths than with radio and infrared waves. True or False?
What observations suggest the mass of the Galaxy goes much farther out than its visible disc?
the rotation curve of the outermost portions of the disc
What is true of the Local Group?
The Andromeda galaxy (M31), and the Milky Way are the two largest galaxies.
The additional energy given off by active galaxies is because of their higher stellar density. True or False?
Why does the Cepheid distance method fail us beyond about 20 Mpc?
Even with the HST, the most luminous Cepheids are too faint to be seen beyond.
What statement about Population II are true?
1)They are made of almost nothing but hydrogen and helium, 2) The globular clusters are their most obvious groupings, 3) Their orbits around the Galaxy resemble those of comets, AND 4)They formed first as the Galaxy formed.
When observing a quasar, we are probably looking at a stage of evolution in the very early universe. True or False?
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