The Doppler technique only provides a measure of the minimum mass of a planet because
A) only a small part of the planet's motion is measured.
B) without a transit observation, the size and therefore density of the planet is unknown.
C) we do not know the exact composition of the planet.
D) only the motion of star toward the observer is measured, not the full motion.
E) we do not have the technology to make a direct image of a planet yet.
D
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The ratio of the radius of a classical electron (re = kee2/mec2 = 2.8 × 10^-15 m) to the radius of a 4He nucleus (r = r0A1/3) is
a. 2.0 b. 0.68 c. 1.5 d. 0.92 e. 2.4
The Huygens probe is an example of which kind of robotic spacecraft?
A) orbiter B) sample return C) lander D) flyby
The weak magnetic fields around Europa and Ganymede were found during flybys of
A) Galileo. B) Stardust. C) Voyager 1. D) Cassini. E) Pioneer 10.
The escape velocity inside a black hole is
A. half the speed of light. B. infinity. C. greater than the speed of light. D. zero. E. unknown.