53 SSM An astronomical unit (AU) is equal to the average distance from Earth to the Sun, about 92.9 X 106 mi. A parsec (pc) is the distance at which a length of 1 AU would subtend an angle of exactly 1 second of arc (Fig. 1-8). A light-year (ly) is the distance that light, trav- An angle of exactly 1 second 1 pc- eling through a vacuum with a speed of 186 000 mi/s, would cover in 1.0 year. Express the Earth-Sun distance in (a) parsecs and (b) light-years. AU 1 1 pc Figure 1-8 Problem 53.

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53 SSM An astronomical unit (AU) is equal to the average
distance from Earth to the Sun, about 92.9 X 106 mi. A
(pc) is the distance at which a length of 1 AU would subtend an
angle of exactly 1 second of
arc (Fig. 1-8). A light-year (ly)
is the distance that light, trav-
eling through a vacuum with a
speed of 186 000 mi/s, would
cover in 1.0 year. Express the
Earth-Sun distance in (a)
parsecs and (b) light-years.
parsec
An angle of
exactly 1 second
1 pc-
-1 AU
1 рс
Figure 1-8 Problem 53.
Transcribed Image Text:53 SSM An astronomical unit (AU) is equal to the average distance from Earth to the Sun, about 92.9 X 106 mi. A (pc) is the distance at which a length of 1 AU would subtend an angle of exactly 1 second of arc (Fig. 1-8). A light-year (ly) is the distance that light, trav- eling through a vacuum with a speed of 186 000 mi/s, would cover in 1.0 year. Express the Earth-Sun distance in (a) parsecs and (b) light-years. parsec An angle of exactly 1 second 1 pc- -1 AU 1 рс Figure 1-8 Problem 53.
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