________ occur about 130 km above Earth's surface near the polar regions when energy in the solar wind guided by Earth's magnetic field excites gases in the upper atmosphere
a. Coronas
b. Flares
c. Auroras
d. Coronal holes
e. Nuclear fission
c
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Which of the following is not a known growth rate for oxides on metals?
(a) Exponential (b) Logarithmic (c) Parabolic (d) Linear
A ____ has a few million light sensitive diodes in an array typically about a half-inch square
a. photometer b. charge-coupled device c. spectrograph d. photographic plate e. grating
Acceleration is greater for a satellite when it is at the
A) apogee (farthest point). B) perigee (closest point). C) zenith. D) same acceleration at all of the above places.
Millisecond pulsars _____
a. are created in supernova explosions of the most massive stars b. result from the collision of two neutron stars c. represent the youngest pulsars detected d. result from long-term mass transfer from a companion star e. are a theoretical prediction that has not been observed