1. The radiant of a meteor shower is a. the apparent vanishing point of the para

Question

1. The radiant of a meteor shower is

a. the apparent vanishing point of the parallel orbital paths of meteoroids

b. the location at which a meteor explodes in the atmoshpere.

c. the radius of a meteoroid's orbit around the sun

d. the radius of a meteoroid's orbit around the earth

2. How is it possible for the tails of a comet to move ahead of the comet itself?

a. The tails are blown outward by the solar wind, wich points radially away from the Sun in all directions

b. As the comet passes perihelion and begins to move back toward the outler Solar System, its tailsare blown ahead of the nucleus itself

c. The nucleus is much heavier than the tails so it always moves slower

d. The attratction of Jupiter causes the lighter tails to be attracted to it, making them move ahead of the nucleus.

e. Both a and b

f. Both c and d.

3. Why has planet formation essentially stopped in the Solar System?

a. Much of the lighter material in the protostellar disk has been swept away by sunlight and solar wind

b. The remaining heavy material( the asteroid belt) is prevented from forming planets due to the fact that when asteroids pass near jupiter duing their orbits, the force of gravitational attraction to Jupiter is larger than the force of gravitational attraction between the asteroids.

c. The moons of the planets have capturedall the leftover materialin the Solar system

d. the giant gas planets have captured all the excess material in the solar system and nothing elso can form

e. both a and b

f. both c and d

Explanation / Answer

1) The radiant of a meteor shower is the spot in the sky, from which meteor appears to be originate. Radiants are spots in the sky not points. A meteor radiant is the location on the sky where all the meteors would appear to come from if we could see them approaching in the very far distance. However, the members of a meteoroid stream do not travel perfectly in parallel; over the centuries their orbits become increasingly scattered. Their nonparallel paths mean that the shower’s perspective point is not really a point.

hence option b is correct. that is the radiant of a meteor shower is the location at which meteor explodes in the atmosphere

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