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2. Galaxy X in the Virgo Cluster has a cosmological redshift in its spectrum of z = 0.003 indicating it is moving away from us at 900 km/s. Galaxy Y has z = 0.015 a) Using z = v/c and our math shortcut, how fast is Galaxy Y moving away from us? (You can review the method in Box 23-2.)

Respuesta :

Answer:

Speed of Galaxy Y is 4500 km/s

Explanation:

As we know that the Galaxy X has redshift given as

[tex]z = \frac{v}{c}[/tex]

[tex]0.003 = \frac{900 km/s}{c}[/tex]

[tex]c = 3\times 10^5 km/s[/tex]

now in similar way for galaxy Y we have

[tex]z = 0.015[/tex]

so we will have

[tex]0.015 = \frac{v}{3 \times 10^5}[/tex]

[tex]v = 4500 km/s[/tex]

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