Basically Harmless

In the dark and distant depths of space, a planet named Earth exists at the center of this undulating and strange complex with infinite probability. At the very edge of the solar system, the worried leader Greyblum sat cross-legged on a green artificial leather sofa, looking anxiously at the rows of TVs and computer screens. He was in great pain. Their mission is to monitor the Earth, but only in secret. ... Arthur said, "Is the Earth still there? I have spent so long searching for the Earth, and the planets I have found are somewhat similar but not exactly the same. The worst one is called this damn planet, and the local bad-tempered little animals even bit me. Of course, half of the time, the Earth does not exist at all because it has been blown up by the damn Vogons. Can you understand what I am saying?" Ford did not answer. He was listening to something else. He handed Arthur the Guide and asked him to look at the screen. The entry on the screen read: "Earth, mostly harmless."