Which of the following best describes the orbital resonance shared by Io, Europa, and Ganymede?
A) Io completes four orbits in the same time it takes Europa to complete two orbits and Ganymede to complete one orbit.
B) Io, Europa, and Ganymede each have the same orbital period around Jupiter.
C) Io, Europa, and Ganymede all show the same face to Jupiter at all times.
D) Io, Europa, and Ganymede are always oriented in a straight line.
A) Io completes four orbits in the same time it takes Europa to complete two orbits and Ganymede to complete one orbit.
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The Great Dark Spot is a feature of ______________
Fill in the blank(s) with correct word
Colliding plates can generate _____________________ ranges
Fill in the blank(s) with correct word
White dwarfs are so called because
A) they are both very hot and very small. B) they are the end-products of small, low-mass stars. C) they are the opposite of black holes. D) it amplifies the contrast with red giants. E) they are supported by electron degeneracy pressure.
A little magnetic compass has a needle whose tips are clearly labeled N and S. The compass is placed next to a single circular loop of wire lying flat on a wooden table. The current in the loop is clockwise. What happens?
A. The S tip of the needle is attracted toward the loop B. The needle orients itself with the N tip pointing in the direction of the current in the segment of the loop closest to the needle C. The needle orients itself with the S tip pointing in the direction of the current in the segment of the loop closest to the needle D. The N tip of the needle is attracted toward the loop E. None of these choices are correct