The Galaxy Song
From the film "Monty Python's Meaning of Life"
Words by Eric Idle
Music by Eric Idle & John Du Perez
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(spoken) 
Whenever life gets you down, Mrs. Brown,
And things seem hard or tough,
And people are stupid, obnoxious or daft,
And you feel that you've had quite enough...
 
(singing)
Just remember that you're standing on a planet that's evolving,
And revolving at nine thousand miles an hour,
That's orbiting at nineteen miles a second, so it's reckoned,
A sun that is the source of all our power.
The sun and you and me and all the stars that we can see,
Are moving at a million miles a day,
In an outer spiral arm, at forty thousand miles an hour,
Of the Galaxy we call the Milky Way.
 
Our Galaxy itself contains 100 billion stars
It's 100,000 light-years side to side,
It bulges in the middle, 16,000 light years thick
But out by us it's just 3,000 light years wide
We're 30,000 light years from galactic central point,
We go round every 200 million years
And our Galaxy is only one of millions of billions
In this amazing and expanding Universe.
 
The Universe itself keeps on expanding and expanding
In all of the directions it can whizz
As fast as it can go, at the speed of light you know,
12 million miles a minute, and that's the fastest speed there is.
So remember when you're feeling very small and insecure
How amazingly unlikely is your birth
And pray that there's intelligent life somewhere up in space
Because there's bugger all down here on Earth.

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Nicked from "The Fairly Incomplete And Rather Badly Illustrated 
Monty Python Song Book" and transcribed by John G. Wright