Free The Wanderer by Fritz Leiber

Earth says it's a—"
    The voice was lost in a ponderous, almost subsonic, grinding roar coming through Don's boots and up his legs. The moon moved sideways a foot or more under Don's feet, throwing him down. In the two seconds he was falling his only active thought was to lift his arms bent-elbowed to make a cage around his helmet, but he could see the gray dust rippling and lifting a little here and there like a thick rug with wind under it, as inertia held it back while the solid moon moved beneath it.
    He crashed hollowly on his back. The roaring multiplied, coming in everywhere through the underside of his suit. Gouts of dust skimmed off around him in low parabolas. His helmet hadn't cracked.
    The roaring faded. He said: "Yo!" and "Yo!" again, and then with his tongue he triggered the Hut whistle.
    The purple-and-yellow highlight glared down at him from the western edge of the Atlantic, touching Florida.
    There was no answer from the Hut.

Chapter Nine
    Paul and Margo started out after the main body of saucer students heading back to the cars. They couldn't recall now who had first said: "We'd better be getting out of here,"
    but once the words had been spoken, agreement and reaction had been swift and almost universal. Doc had wanted to stick with his umbrella-and-table-corner astrolabe, and had tried to browbeat a nucleus of informed observers to stay with him, but he finally had been dissuaded.
    "Rudy's a bachelor," Hunter explained to Margo as a few of them waited for Doc to gather his things. "He's willing to stay up all night making observations or chess moves, or trying to make burlesque babes —" he shouted the last back toward Doc—"but the rest of us have got families."
    As soon as the idea of leaving had been proposed, Paul had been in a sweat to get to Moon Project headquarters. He and Margo would swing around direct to Vandenberg Two, he decided; in fact, he had been about to suggest to her that they tramp to the beach gate—it might be quicker—when ha remembered that admission clearance would be delayed there.
    Then just as they had been setting out, among the first to leave, Miaow, perhaps encouraged by seeing Ragnarok put on leash, had sprung from Margo's arms to investigate the under parts of the dance floor. Ann had stayed to witness the recovery of Miaow, and Rama Joan with her daughter. The last two made a queer sight: the calm-eyed little girl with her pale red braids and the mannish woman in her rumpled evening clothes.
    When Doc came bustling along, the six of them set out, stepping briskly along to catch up with the others.
    Doc jerked a thumb at the bearded man. "Has this character been daggering my reputation?" he demanded of Margo.
    "No, Professor Hunter has been building it up," she told him with a grin. "I gather your name is Rudolf Valentino."
    "No, just Rudolf Brecht," Doc chortled, "but the Brechts are a sensuous clan, too, heigh-ho!"
    "I see you forgot your umbrella," Hunter told him, instantly clamping a hand on Doc's elbow. "Not that I'm going to let you go back for it."
    "No, Ross," Doc told Hunter, "I deliberately left it stuck there—that bumbershoot is already a kind of monument. Incidentally, I want to go on record that we're all being fools. Now we'll be fighting traffic the whole night, whereas we could have employed it in fruitful observation at an ideal location—and I'd have treated you all to a big farm breakfast!"
    "I'm not at all sure about that ideal location part," Hunter began somberly, but Doc cut him off by pointing up at the Wanderer as he strode along and demanding: "Hey, granting that thing's a genuine planet, what do you think the yellow and maroon areas are? I'll plump for yellow desert and oceans full of purple algae and kelp."
    "Arid flats of sublimated iodine and sulphur," Hunter hazarded wildly.
    "With a border patrol of Maxwell's demons to keep them separate, I suppose?" Doc challenged amiably.
    Paul looked up. The purple margin-band was wider now and