
Concept explainers
(a)
The distance to M51 in

Answer to Problem 7Q
Distance in
Explanation of Solution
Given data Distance modulus of the supernova 19941 in M51 =
Distance modulus of the planetary nebulae in M51 =
Distance to Andromeda Galaxy from Earth =
Formula used
Calculation
Conclusion Distance in
(b)
The distance in

Answer to Problem 7Q
Distance in
Explanation of Solution
Given data Distance modulus of the supernova 19941 in M51 =
Distance modulus of the planetary nebulae in M51 =
Distance to Andromeda Galaxy from Earth =
Formula used
Calculation
Conclusion
Distance in
(c)
The difference between the calculated distances in part (a) and part (b).

Answer to Problem 7Q
Difference between the 2 calculated values =
Explanation of Solution
Given data Distance modulus of the supernova 19941 in M51 =
Distance modulus of the planetary nebulae in M51 =
Distance to Andromeda Galaxy from Earth =
Calculation
Conclusion
(d)
Compares differencecalculated value in part c, with the

Answer to Problem 7Q
Explanation of Solution
Given data Distance modulus of the supernova 19941 in M51 =
Distance modulus of the planetary nebulae in M51 =
Distance to Andromeda Galaxy from Earth =
Calculation
Conclusion
It shows that when the distance increase, the error associated with the reading increases as well.
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Chapter 23 Solutions
Universe: Stars And Galaxies
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