The Birth of Modern Cosmology
In 1877, when Mars approached Earth very closely.
An italian astronomer observed some dark markings,
Calling them “canali”, in italian, meaning “channels”.
Percival Lowell was later intrigued by the find of
These “canali”, the word perhaps taken by him
To mean canals, for some were straight,
Implying that they had to be made by Martians.
It would be, of course,
That Mars is a dry planet
And so water would have
To be transported
To the more arid regions.
Strangely, all this led to one of
The strangest discoveries in science:
That most of the universe was missing.
Percival Lowell had by now developed
An obsession with life on Mars.
In 1894, he decided that
The clear Arizona skies above Flagstaff
Would be perfect for the task
Of finding this alien civilization.
Vesto Melvin Slipher, an Indiana farm boy,
Became Lowell’s assistant in 1901—
Taken on, reluctantly, by Lowell,
As a favor to a friend,
For a short fixed term.
Slipher left 53 years later,
When he retired from the position
Of observatory director,
Having kick-started modern cosmology.
Spiral nebulae, called “Island Universes”
By Immanuneul Kant,
Were an enigma at the time.
Slipher had been using the Clark telescope
To measure whether the nebulae
Were moving relative to Earth,
Utilizing a spectrograph,
An instrument that splits light
Into its constituent colors,
Realizing that the colors would change
If the nebulae were moving
Towards or away from Earth,
Such as if a rainbow moves away from us
There will be a resultant red shift,
As the incoming waves per second get a boost,
Or a blue shift if it’s moving towards us,
The incoming waves per second getting reduced.
He found that Andromeda was heading towards us,
While very many of the others were receding,
And some very quickly, at that.
The nebulae, he suggested,
Are “stellar systems seen at great distances”.
Something was blowing our universe apart,
And something else was holding
Each galaxy together,
Not to mention that we could
Now surmise the Big Bang,
And that most of the universe was missing.