What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz.
b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths.
c. Quasars showed significant gravitational lens effects.
d. The spectra of quasars looked like that of an M dwarf.
e. The larger redshifts originally indicated that they were orbiting the center of the Milky Way.
b
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Mathematical models indicate that ____ galaxies are produced by high speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy
a. ring b. spiral c. antenna d. irregular e. tidal tail
Why is the impact theory now preferred as an explanation for the Moon's origin?
What will be an ideal response?
Large-capacity (~ 22 ft3) refrigerators that are freezer on top use about 600 kWh/yr while side by side refrigerator-freezers of the same capacity use about 660 kWh/yr. Each costs about $1000
What will be the total cost after 19 years? Which one should you buy? What considerations enter into your decision?
As water is withdrawn from a well, the water table around the well
A) subsides. B) drops, making a cone of depression around the well. C) dries up. D) rises.