Jonathan Strahan - The Best Science Fiction & Fantasy of the Year Volume 5 An anthology of stories

“Have I frightened you, my boy?”

“Everything frightens me these days, Professor Massri. You’re about to tell me that you’ve found a monolith in the back garden, along with the discarded cans and the mangy cats.”

The Egyptian laughed, phlegm shaking his chest. “Almost. Almost. The Moon is now on orbit a bit over. A million kilometers from Venus. Also retrograde. Exactly the same distance Ganymede. Used to be from Jupiter.”

“Well, okay, hardly a coincidence. And Ganymede is in the Moon’s old orbit.”

For a moment, Massri was silent. His face was drawn. He put down his coffee with a shaking hand.

“No. Ganymede orbits Venus some 434,000 kilometers out. According to the last data I could find before. The net went down for good.”

“Farther out than the Moon used to orbit Earth. And?”

“The Sun, from Venus, as you once told me. Looks brighter and larger. In fact, it subtends about 40 minutes of arc. And by the most convenient and. Interesting coincidence. Ganymede now just exactly looks…”

“…the same size as the Sun, from the surface of Venus.” Ice ran down Blackett’s back. “So it blocks the Sun exactly at total eclipse. That’s what you’re telling me?”

“Except for the corona, and bursts of solar flares. As the Moon used to do here.” Massri sent him a glare almost baleful in its intensity. “And you think that’s just a matter of chance? Do you think so, Dr. Blackett?”

The thunderstorm on the previous day had left the air cooler. Blackett walked home slowly in the darkness, holding the HP calculator and two books the old man had perforce drawn upon for data, now the internet was expired. He did not recall having carried these particular volumes across the street from the empty library. Perhaps Clare or one of the other infrequent visitors had fetched them.

The stars hung clean and clear through the heavy branches extending from the gardens of most of the large houses in the neighborhood and across the old sidewalk. In the newer, outlying parts of the city, the nouveaux riches had considered it a mark of potent prosperity to run their well-watered lawns to the very verge of the roadway, never walking anywhere, driving to visit neighbors three doors distant. He wondered how they were managing on Venus. Perhaps the ratio of fit to obese and terminally inactive had improved, under the whip of necessity. Too late for poor Kafele, he thought, and made a mental note to stockpile another batch of pioglitazone, the old man’s diabetes drug, when next he made a foray into a pharmacy.

He sat for half an hour in the silence of the large kitchen, scratching down data points and recalculating the professor’s estimates. It was apparent that Massri thought the accepted extinction date of the great reptiles, coinciding as it did with the perfect overlap of the greater and lesser lights in the heavens, was no such thing—that it was, in fact, a time-stamp for Creation. The notion chilled Blackett’s blood. Might the world, after all (fashionable speculation!), be no more than a virtual simulation? A calculational contrivance on a colossal scale? But not truly colossal, perhaps no more than a billion lines of code and a prodigiously accurate physics engine. Nothing else so easily explained the wholesale revision of the inner solar system. The idea did not appeal; it stank in Blackett’s nostrils. Thus I refute, he thought again, and tapped a calculator key sharply. But that was a feeble refutation; one might as well, in a lucid dream, deny that any reality existed, forgetting the ground state or brute physical substrate needed to sustain the dream.

The numbers made no sense. He ran the calculations again. It was true that Ganymede’s new orbit placed the former Jovian moon in just the right place, from time to time, to occult the sun’s disk precisely. That was a disturbing datum. The dinosaur element was far less convincing. According to the authors of these astronomy books, Earth had started out, after the tremendous shock of the X-body impact that birthed the Moon, with a dizzying 5.5 or perhaps 8-hour day. It seemed impossibly swift, but the hugely larger gas giant Jupiter, Ganymede’s former primary, turned completely around in just 10 hours.

The blazing young Earth spun like a mad top, its almost fatal impact wound subsiding, sucked away into subduction zones created by the impact itself. Venus—the old Venus, at least—lacked tectonic plates; the crust was resurfaced at half-billion-year intervals, as the boiling magma burst up through the rigid rocks, but not enough to carry down and away the appalling mass of carbon dioxide that had crushed the surface with a hundred times the pressure of Earth’s oxygen-nitrogen atmosphere. Now, though, the renovated planet had a breathable atmosphere. Just add air and water, Blackett thought. Presumably the crust crept slowly over the face of the world, sucked down and spat back up over glacial epochs. But the numbers—

The Moon had been receding from Earth at a sluggish rate of 38 kilometers every million years—one part in 10,000 of its final orbital distance, before its removal to Venus. Kepler’s Third Law, Blackett noted, established the orbital equivalence of time squared with distance cubed. So those 65.5 million years ago, when the great saurians were slain by a falling star, Luna had been only 2500 km closer to the Earth. But to match the sun’s sidereal rotation exactly, the Moon needed to be more than 18,000 km nearer. That was the case no more recently than 485 million years ago.

Massri’s dinosaur fantasy was off by a factor of at least 7.4.

Then how had the Egyptian reached his numerological conclusion? And where did all this lead? Nowhere useful that Blackett could see.

It was all sheer wishful thinking. Kafele Massri was as delusional as Clare, his thought processes utterly unsound. Blackett groaned and put his head on the table. Perhaps, he had to admit, his own reflections were no more reliable.

“I’m flying down to the coast for a swim,” Blackett told Clare. “There’s room in the plane.”

“A long way to go for a dip.”

“A change of scenery,” he said. “Bring your bathing suit if you like. I never bother, myself.”

She gave him a long, cool look. “A nude beach? All right. I’ll bring some lunch.”

They drove together to the small airfield to one side of the industrial park in a serviceable SUV he found abandoned outside a 7-Eleven. Clare had averted her eyes as he hot-wired the engine. She wore sensible hiking boots, dark gray shorts, a white wife-beater that showed off her small breasts to advantage. Seated and strapped in, she laid her broad-brimmed straw hat on her knees. Blackett was mildly concerned by the slowly deteriorating condition of the plane. It had not be serviced in many months. He felt confident, though, that it would carry him where he needed to go, and back again.

During the 90-minute flight, he tried to explain the Egyptian’s reasoning. The young psychiatrist responded with indifference that became palpable anxiety. Her hands tightened on the seat belt cinched at her waist. Blackett abandoned his efforts.

As they landed at Matagorda Island, she regained her animation. “Oh, look at those lovely biplanes! A shame they’re in such deplorable condition. Why would anyone leave them out in the open weather like that?” She insisted on crossing to the sagging Stearmans for a closer look. Were those tears in her eyes?

Laden with towels and a basket of food, drink, paper plates and two glasses, Blackett summoned her sharply. “Come along, Clare, we’ll miss the good waves if we loiter.” If she heard bitter irony in his tone, she gave no sign of it. A gust of wind carried away his own boater, and she dashed after it, brought it back, jammed it rakishly on his balding head. “Thank you. I should tie the damned thing on with a leather thong, like the cowboys used to do, and cinch it with a… a…”