Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 1, Problem 34Q
To determine
The definition of an astronomical unit (au) and give an example citing a situation in which it would be convenient to use a unit of this measure.
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The nearest star to our sun is Proxima Centauri, at a distance of 4.3 light-years from the Sun. A light-year is the distance that light travels in one year (365 days). How far away, in kilometers, is Proxima Centauri from the Sun?Express your answer using two significant figures.
Consider a star at a distance of 100 light years from the Earth and is moving
relative to the Earth at a constant velocity of 70000 km/hr perpendicular to its line
of sight from the Earth. What is the change of its angular position on our sky
when viewed by us now and by the ancient Egyptian 6000 years ago? Ignore all
other effect, e.g., the axial precession of the Earth.
1.
(A)
0.24 arcsecond
(В)
13 arcminutes
(C)
0.5 degree
(D)
2.6 degrees
(E)
5.0 degrees
How do convert Astronomical Units to Kilometers?
Chapter 1 Solutions
Universe
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