More Things in Heaven and Earth, by astrogirl2
Written for the prompt "Larry Fleinhardt, The Doctor, sense of wonder, alien planets." "My own suspicion," said the great naturalist J.B.S. Haldane, "is that the universe is not only queerer than we suppose, but queerer than we can suppose."
If you're a Larry fan and know something about Doctor Who, this is a must-read.