When the nuclear reactions begin making too little energy in a star, by virtue of the natural thermostat, the star:
A) would contract slightly.
B) would reduce its central temperature.
C) would reduce its density.
D) would increase the mass by a factor of 2.
A
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Which internal energy source is the most important in continuing to heat the terrestrial planets today?
A) accretion B) differentiation C) radioactivity D) tidal heating
The Earth lies close to the center of the Galaxy
Indicate whether the statement is true or false
Which two of the following places are nearest to each other? Place A at latitude 20°N, longitude 90°W Place B at latitude 30°N, longitude 90°W Place C at latitude 30°N, longitude 75°W Place D at latitude 20°N, longitude 75°W
The wavelength of the wave shown in this figure is about
a.
2 m.
b.
1.75 m.
c.
0.33 m.
d.
not defined.
e.
slightly over 5 m.