Which statement about stellar motion is incorrect?
A) In general, the closer a star is, the more its proper motion.
B) The radial velocity is measured by the Doppler shift.
C) The transverse velocity is measured by the proper motion and the distance.
D) Like parallax, proper motion is measured over intervals of exactly six months.
E) The Pythagorean theorem relates space, transverse, and radial velocities.
D
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Kuiper Belt is a collection of iron meteorites
Indicate whether the statement is true or false
The length 3.76 mm is divided by 0.0232 mm. The rounded ratio is
A. 160. B. 162. C. 162.1. D. 162.07. E. 162.069.
Which path correctly indicates the motion of the pendulum bob when it is cut at the instant it is at the top of its swing?
A. A
B. B
C. C
D. D
What is the most likely reason that there are no giant planets beyond Neptune?
A) Any planets forming beyond Neptune would have drifted out of the solar system due to the weakness of the Sun's gravity at this distance. B) There was no material to create planetesimals beyond the orbit of Neptune. C) By the time planetesimals grew to a large enough mass to hold onto an atmosphere, the solar nebula had been blown away. D) Any planet forming beyond Neptune's orbit would have been scattered outside of the solar system by gravitational encounters. E) There may be, but they would be so faint that astronomers have not found them yet.