A little while, their hunger unfulfilled,
The mothlike worlds flit 'round the guttering sun.
("Ephemera")

What silence rules the ghostly hours
That guard the close of human sleep!
(“The Testimony of the Suns”)

And starward drifts the stricken world,
Lone in unalterable gloom
Dead, with a universe for tomb,
Dark, and to vaster darkness whirled.
(“The Testimony of the Suns”)

But life is just a party, and parties weren't meant to last.

O Space and Time and stars at strife,
How dreadful your infinity!
Shrined by your termless trinity,
How strange, how terrible, is life!
(“The Testimony of the Suns”)

If it happens that the human race doesn't make it, then the fact that we were here once will not be altered, that once upon a time we peopled this astonishing blue planet, and wondered intelligently at everything about it and the other things who lived here with us on it, and that we celebrated the beauty of it in music and art, architecture, literature, and dance, and that there were times when we approached something godlike in our abilities and aspirations. We emerged out of depthless mystery, and back into mystery we returned,and in the end the mystery is all there is.