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What is the recession speed for a galaxy cluster 100Mpc away from us? Is the light...

What is the recession speed for a galaxy cluster 100Mpc away from us? Is the light from that galaxy red-shifted or blue shifted?

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Answer #1

Theory:

From Hubble law we know:

Were, V is velocity of recession,

is Hubble's constant = 73.8 km/sec/Mpc

distance d is in Mpc

CALCULATION:

Thus a galaxy cluster 100Mpc away from us will move at speed of

Thus The Recession speed will be

V= 7380km/sec

THUS A GALAXY CLUSTER 100Mpc away from us will be moving at 7380km/sec.

•And the light from that galaxy red-shifted (as they are moving away from us).

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