As a moon in a very elliptical orbit moves closer to and then farther from a planet, gravity flexes the moon with tides, and friction heats the interior. This process is referred to as
a. tidal heating.
b. occultation.
c. vaporization.
d. differentiation.
e. sublimation.
Question 2If the red shift of a quasar were 3, at what wavelength would the 486.1 nm line of hydrogen appear in the quasar's spectrum?
What will be an ideal response?
Question 3The grooved terrain found on Ganymede is believed to be
a. flow channels or liquid water.
b. flow channels or liquid methane.
c. a system of faults in the crust.
d. the peaks of water waves in a large ocean.
e. caused by meteor impacts with the surface of Ganymede.
Question 4____________________ Seyfert galaxies are very luminous at X-ray and ultraviolet wavelengths and have broad emission lines in their spectra.
Fill in the blank(s) with correct word
Question 5The Roche limit is the
a. distance from the sun within which a planet can not retain an atmosphere.
b. minimum mass of an object in the solar system that would be classified as a planet.
c. maximum separation distance between the sun and a given planet.
d. distance from Earth at which we loose radio communication with a satellite.
e. distance from a planet within which a planet can not hold itself together.
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