Briefly describe the characteristics of an elliptical galaxy
What will be an ideal response?
Elliptical galaxies are rounded shapes that are elliptical (elongated) in cross section. Elliptical galaxies contain old stars. Stars in elliptical galaxies are on randomly oriented, elongated orbits. Elliptical galaxies have very little gas and dust.
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On a giant rotating turntable are two clocks, one at the center and the other at the rim.The clock that runs slower is at
A) the center of the turntable. B) the rim of the turntable. C) either of these
Starship "Alpha" travels at 0.9c past an identical starship "Beta," which is at rest. Both a cabin boy on the "Alpha" and a cook on the "Beta" measure the time required for the other ship to pass by their respective windows. Who measures the longer time?
A. The cabin boy B. Both measure the same time C. The measured times cannot be compared D. The cook
Why can't the elements of a compound be separated from one another by physical means?
A) They are too homogeneous when found within a compound. B) Their atoms are too tightly bound to one another. C) Elements found within a compound tend to be inert. D) Elements tend not to be soluble in water.
To a reasonable approximation, the density of a nucleus
A) varies unpredictably for different values of Z. B) is independent of the mass number. C) is greater for large-Z nuclei. D) is smaller for large-Z nuclei.