Contrast the Oort cloud and the Kuiper belt as possible origins for comets
What will be an ideal response?
Most long-period comets come from random directions, and have very elongated orbits, suggesting origin in the distant Oort cloud. Kuiper belt bodies seen to date move in the ecliptic, with fairly circular orbits, and much closer to the Sun, just beyond the orbit of Neptune. Perhaps collisions between Kuiper belt worlds might create some short period comets, just as collisions between asteroids might send some meteoroids toward Earth, but this will be rare.
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Most pulsars _____
a. speed up their rotation as they age b. become more luminous as they age c. emit lower energy radiation as they age d. emit higher energy radiation as they age e. slow downtheir rotation as they age
The magnitude scale
a. originated just after the telescope was invented. b. can be used to indicate the apparent intensity of a celestial object. c. was devised by Galileo. d. is no longer used today. e. was used to determine the rate of precession.
The bond between carbon atoms in the molecule acetylene, HC=CH is referred to as
A) an ionic bond B) a double bond C) a single bond D) a triple bond
The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
A) Mass is less, weight is the same. B) Mass is the same, weight is less. C) Both mass and weight are less. D) Both mass and weight are the same.