What is the evidence for the existence of the Oort cloud?
A) Objects of the Oort cloud were detected by the Hubble Space Telescope.
B) The fact that new comets continue to appear indicates that a distant reservoir of icy bodies must exist.
C) the fact that many comets orbit on the ecliptic
D) the fact that some comets have retrograde orbits
Correct Answer:
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Q41: Comets are rich in _.
A) water
B) carbon
Q42: The short-period comets originate in _ and
Q43: The radiant is the common point from
Q44: Meteor showers are generally named
A) after the
Q45: What proves the existence of the Kuiper
Q47: The Leonid meteor shower occurs in mid-November.
Q48: _ travel(s) the farthest from the Sun.
A)
Q49: The tail of a comet always points
Q50: The typical size of a comet's nucleus
Q51: What is the Kuiper Belt?
A) a swarm
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