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How big is our galaxy and how fast is the universe expanding?

Answer 1

Our galaxy is 100-180 k ly wide, with 2 k ly bulge at the center. Our universe is expanding at the rate of 71 km/sec/mega parsec.

In this case, k = 1000 and ly = light year unit of distance = 62900 X(Earth-Sun distance), approximately.

The larger unit of measurement, the mega parsec (equal to million parsec), is equivalent to 206265 X (the Earth-Sun distance).

Unit of measurement for the average Earth-Sun distance is AU = 149597871 km.

It is scientifically surmised that our universe, expanding at the rate of Hubble Constant #H_0# = 71 km/s/mega parsec. has attained radial expansion to 13.8 billion light years, in 13.8 billion years.

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Answer 2

Lydia Allen

The Hubble constant, which measures the precise rate of expansion of the universe, is currently estimated to be approximately 73.3 kilometers per second per megaparsec. The Milky Way galaxy has a diameter of approximately 100,000 light-years.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.