   Chapter 34, Problem 7PE

Chapter
Section
Textbook Problem

(a) What is the approximate speed relative to us of a galaxy near the edge of the known universe, some 10 Gly away? (b) What traction of the speed of light is this? Note that we have observed galaxies moving away from us at greater than 0.9c.

To determine

(a)

The approximate speed relative to us of a galaxy.

Explanation

Given data:

Distance to the galaxy is d=10Glyor10Gly×103Mly1Gly.

Hubble constant is H0=20kms/Mly.

Formula used:

The recession velocity for a galaxy is,

v=H0d   ......... (1)

Calculation:

Substitute the given value in equation (1)

To determine

(b)

The fraction of speed of light and recession velocity.

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