How do we know our galaxy is moving?

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Answer 1 · 2016-05-27T08:20:37

The motion of galaxies is relative, They get away from one another. So, each is moving, relative to another.

In our universe, galaxies are centered star-world islands.

Measurements reveal that they recede from one another.

So, our galaxy is moving, and the motion is relative to others.

Hubble's constant $H_{0} = 71$ $H_0=71$ km/sec/parsec is an estimate of this

recession speed.

The reciprocal (after unit conversions for parity ) $\frac{1}{H_{0}} = 13.8$ $1/H_0=13.8$ billion

years is an estimate for the age of our universe.