Galena belongs to the class of minerals known as the
A) sulfides.
B) sulfates.
C) silicates.
D) carbonates.
Answer: A
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Differences in absolute magnitude correspond to ratios of ________.
A. distance B. luminosity C. mass D. temperature E. brightness
Of the first exoplanets found, most were detected by:
A) noting the drop in the star's light as the planet transits its disk. B) imaging them with the HST in the infrared, where they are easier to stop. C) noting the Doppler shifts of the star as the planet orbits it from side to side. D) receiving radio transmissions from them, much like Jupiter emits. E) detecting the oxygen in their atmospheres spectroscopically.
_____ is the closest planet to the Sun
A) Earth B) Venus C) Mercury D) Mars
An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component
A) towards the north. B) towards the south. C) upward. D) downward. E) towards the west.