How do astronomers think Jupiter generates internal heat?
a. fusion
b. chemical reactions
c. friction due to its fast rotation
d. shrinking and releasing gravitational potential energy
e. tidal heating
Ans: d. shrinking and releasing gravitational potential energy
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About how much mass does our galaxy contain?
A. 1 billion solar masses B. 1020 solar masses C. 1 million solar masses D. 1011 solar masses
When the equation NH4NO3? N2O + H2O is balanced, the coefficient of N2O is
a. 3. b. 4. c. 2. d. 1.
What kind of thermal radiation does Earth emit?
A) infrared light B) visible and ultraviolet light C) infrared and visible light D) infrared, visible, and ultraviolet light E) visible light
If we know the size of an asteroid, how can we determine its density?
A) comparing its reflectivity to the amount of light it reflects B) looking for brightness variations as it rotates C) determining its mass from its gravitational pull on a spacecraft, satellite, or planet D) radar mapping E) spectroscopic imaging