But now I only hear
Its melancholy, long, withdrawing roar,
Retreating, to the breath
Of the night-wind, down the vast edges drear
And naked shingles of the world.
From Matthew Arnold's "Dover Beach".
Perhaps the radio roar is the disturbance left behind by the rapid expansion of space. Or perhaps not. Of course, this is not what Arnold was talking about. Follow the link to see the antecedent of his "Its"...