Answer:
Mars is nearer the end of its existence than Earth.
Step-by-step explanation:
Herbert George Wells in his science fiction story "The War of the Worlds" tells the story of extra terrestrial creatures from space invading life on Earth. It is also one of the earliest stories or works of literature that talks about alien invasion or alien-human conflict.
In the first chapter of the book, "The Eve of the War", the unnamed narrator and protagonist talks of how Mars is older than our Earth. The line provided in the question "It necessarily follows that [Mars] is not only more distant from time's beginning but nearer its end " implies that Mars is nearing it's end of existence in comparison to earth.