Six months of daylight at the South Pole begins when the Sun is at the
a. winter solstice.
b. summer solstice.
c. autumnal equinox.
d. vernal equinox.
c
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In a spectroscopic binary system, the star showing the larger blue shift is:
A) cooler and receding the fastest. B) less massive of the pair and receding slower. C) more massive and approaching us. D) less massive and approaching us at this moment. E) hotter and receding faster.
The hydrogen lines of spectral type A main sequence stars are ____
a. the strongest b. the weakest c. the most narrow d. useful in determining apparent magnitude e. used to estimate the luminosity of the star
The peak output of a generator is 20. A and 240. V. What average power is provided by the generator?
What will be an ideal response?
Contrast the results of a collision between two spiral galaxies on their stars and their gas and dust clouds
What will be an ideal response?