If a galaxy is 570 Mly away from us, how fast do we expect it to...

Question

Question

If a galaxy is 570 Mly away from us, how fast do we expect it to be moving and in what direction?

Answer 1

Answer #1

Solution:

hubble's law gives the way to measure the distance between galaxies.

From this law the speed of the galaxy is

$speed = H\times R$

Where H is the hubble's constant and R is the distance of a galaxy. Present hubble's value is 70 km/s for every one Megaparsec.

The speed of every galaxy increases by this value for every one mega par sec increases in distance.

Therefore the speed of the galaxy is

$speed = 70 \times 570 = 39900 km/s$

The galaxy is moving away with the above speed.

Answer 2

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