Change this paragraph to be more logical:
He has the luck to be involved in a startling discovery: not only is the Belt proven to be what is left of an exploded planet Lucifer. Also remains are found of that planet's inhabitants, who had been responsible for Belt's destruction.
He has the luck to be involved in a startling discovery: not only is the Belt proven to be what is left of an exploded planet Lucifer, but also remains are found of that planet's inhabitants, who had been responsible for its destruction.