# Scottish Higher: Physics | Hubble's Law

in busy •  2 years ago

Edwin Hubble measured the recessional velocities (the speed galaxies move away from earth).
He found that:

• Most galaxies (distant ones) all move away from earth.
• Galaxies that are more distant travel at a greater velocity

The relationship between galaxy distance and speed is:

• V = H0d
• V = Recessional Velocity
• H0 = Hubble's Constant (2.3×10-18 S-1)
• d = Distance from location to galaxies.

Related relationships / formulae:

• d÷t = H0d
• 1÷t = H0
• t = 1÷H0 (t = Age of the universe)

Calculating the age of the universe:

• t = 1÷H0
• t = 1÷2.3×10-18
• t = 4.3×1017 Seconds
• t = 7.24...×1015 Minuites (÷60)
• t = 1.20...×1014 Hours (÷60)
• t = 5.03...×1012 Days (÷24)
• t = 1.37...×1010 365-Day-Years (÷365)
• t = 1.37...×1010 Real (365.25 Day) Years (Slight Difference) (÷365.25)
• t = ~ 13'444'429'480 Real Years
• t = ~ 13.7 Billion Real Years

### Fun Facts:

Standard candles are stars that we know the real light level of

The slope or gradient of current distance away ÷ original distance away is always the same, no matter your home galaxy.

Double the distance away means that it has double the rate of expansion

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·  2 years ago

Too hard for me to comprehend

·  2 years ago

What are you finding difficult?

·  2 years ago

Thanks for sharing

·  2 years ago

No problem, thanks for taking an interest!

·  2 years ago (edited)

Well done . learn a lot from your post.
@stbrians Why do you find it hard?

·  2 years ago

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·  2 years ago

You are welcome. Keep up the good work. I will be following your posts ;)