Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 10^4 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
a. measured by one clock fixed at one spot on Senesca.
b. measured by one clock fixed at one spot on the spaceship.
c. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting.
d. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting.
e. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.
b
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The limiting level below which a stream cannot erode the land is called its
a. base level. b. ultimate level. c. bed level. d. erosion level.
Observations of the shift toward the red in stellar absorption spectra for stars in galaxies outside out own implies that
A. these stars are receding away from us. B. objects observed in the light of these stars will appear more blue than red. C. these stars are part of a rapidly spinning galaxy. D. these stars are headed toward us.
We can describe the position of an object in our local sky by stating its
A) altitude and meridian. B) altitude and direction. C) latitude and direction. D) latitude and longitude. E) meridian and longitude.
The ________ blows out of the coronal holes
Fill in the blank(s) with correct word