Question

An object is $1.5 \times 10^{4}$ ly from us and does not have any motion relative to us except for the motion due to the expansion of the universe. If the space between us and it expands according to Hubble's law, with $H=21.8 \mathrm{~mm} / \mathrm{s} \cdot \mathrm{ly},$ (a) how much extra distance (meters) will be between us and the object by this time next year and (b) what is the speed of the object away from us?

Name: An object is 1.5 × 10^4 ly from us and does not have any motion relative to us except for the motion due to the expansion of the universe. If the space between us and it expands according to Hubble's law, with H=21.8 mm / s·ly, (a) how much extra distance (meters) will be between us and the object by this time next year and (b) what is the speed of the object away from us?
Uploaded: 2022-06-20T05:44:42-08:00
Duration: 1 min 54 s
Channel: Timothy James
Description: An object is 1.5 × 10^4 ly from us and does not have any motion relative to us except for the motion due to the expansion of the universe. If the space between us and it expands according to Hubble's law, with H=21.8 mm / s·ly, (a) how much extra distance (meters) will be between us and the object by this time next year and (b) what is the speed of the object away from us?

          An object is $1.5 \times 10^{4}$ ly from us and does not have any motion relative to us except for the motion due to the expansion of the universe. If the space between us and it expands according to Hubble's law, with $H=21.8 \mathrm{~mm} / \mathrm{s} \cdot \mathrm{ly},$ (a) how much extra distance (meters) will be between us and the object by this time next year and (b) what is the speed of the object away from us?

Added by Lu-S E.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Timothy James

06/20/2022

Step 1

Given: Distance to the object = $1.5 \times 10^{4}$ ly Hubble parameter, $H = 21.8 \, \text{mm/s/ly}$ Time in a year = 31.5 million seconds Extra distance = $H \times \text{Distance to the object} \times \text{Time in a year}$ Extra distance = $21.8 \, Show more…

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An object is $1.5 \times 10^{4}$ ly from us and does not have any motion relative to us except for the motion due to the expansion of the universe. If the space between us and it expands according to Hubble's law, with $H=21.8 \mathrm{~mm} / \mathrm{s} \cdot \mathrm{ly},$ (a) how much extra distance (meters) will be between us and the object by this time next year and (b) what is the speed of the object away from us?