Not too folky, but The Moody Blues did a whole album in 1969 that was generally Apollo 11/cosmos-oriented, To Our Children's Children's Children.

It kicks off with "Higher and Higher", which is a kind of sung semi-poem:

       Blasting, billowing, bursting forth
       With the power of ten billion butterfly sneezes
       Man with his flaming pyre
       Has conquered the wayward breezes

       Climbing to Tranquility
       Far above the cloud
       Conceiving the heavens
       Clear of misty shroud

    Higher and higher
    Now we've learned to play with fire
    Go higher and higher and higher

       Vast vision must improve our sight
       Perhaps at last we'll see an end
       To our home's endless blight
       And the beginning of the Free

       Climb to Tranquility
       Finding its real worth
       Conceiving the heavens
       Flourishing on earth

    Higher and higher
    Now we've learned to play with fire
    We go higher and higher and higher