"And that’s the last funny thing?"

"Yep, that’s about the broad outline. No, wait a minute-last funny thing plus one. How come none of the meteorites in the shower hit Earth? Plenty of eroded remains of terrestrial meteorite craters have been identified and dated. All the computer simulations say that there should be a peak of abnormal activity at around this time, judging from how big the heap of crud that hit the Moon must have been. But there aren’t any signs of one, even allowing for the effects of the atmosphere."

Hunt and Steinfield spent the rest of that day and all of the next sifting through figures and research reports that went back many years. Hunt did not sleep at all during the following night, but smoked a pack of cigarettes and consumed a gallon of coffee while he stared at the walls of his hotel room and twisted the new information into every contortion his mind could devise.

Fifty thousand years ago the Lunarians were on the Moon. Where they came from didn’t really matter for the time being; that was another question. At about the same time an intense meteorite storm obliterated the Farside surface. Did the storm wipe out the Lunarians on the Moon? Possibly-but that wouldn’t have had any effect on them back on whatever planet they had come from. If all the UNSA people on Luna were wiped out, it wouldn’t make any lasting difference to Earth. So, what happened to the rest of the Lunarians? Why hadn’t anybody seen them since? Had something else happened to them that was more widespread than whatever happened on the Moon? Could the something else have caused the meteorite storm? Could a second something else have both caused the first and extinguished the Lunarians in other places? Perhaps there was no connection? Unlikely.

Then there were the inconsistencies that Steinfield had talked about… An absurd idea came from nowhere, which Hunt rejected impatiently. But as the night wore on, it kept coming back again with growing insistence. Over breakfast he decided that he had to know the story that lay below those billions of tons of rubble. There had to be some way of extracting enough information to reconstruct the characteristics of the surface just before the bombardment commenced. He put the question to Steinfield later on that morning, back in the lab.

Steinfield shook his head firmly. ‘We tried for over a year to make a picture like that. We had twelve programmers working on it. They got nowhere. It’s too much of a mess down there-all ploughed up. All you get is garbage."

"How about a partial picture?" Hunt persisted. Was there any way that a contour map could be calculated, showing just the distribution of radiation sources immediately prior to the bombardment?

"We tried that, too. You do get a degree of statistical clustering, yes. But there’s no way we could tell where each individual sample was when it got irradiated. They would have been thrown miles by the impacts; a lot of them would have been bounced all over the place by repeat impacts. Nobody ever built a computer that could unscramble all that entropy. You’re up against the second law of thermodynamics; if you ever built one, it wouldn’t be a computer at all-it would be a refrigerator."

"What about a chemical approach? What techniques are available that might reveal where the prebombardment craters were? Could their ‘ghosts’ still be detected a thousand feet down below the surface?"

"No way!"

"There has to be some way of reconstructing what the surface used to look like."

"Did you ever try reconstructing a cow from a truckload of hamburger?"

They talked about it for another two days and into the nights at Steinfield’s home and Hunt’s hotel. Hunt told Steinfield why he needed the information. Steinfield told Hunt he was crazy. Then one morning, back at the laboratory, Hunt exclaimed, "The Nearside exceptions!"

"Huh?"

"The Nearside craters that date from the time of the storm. Some of them could be right from the beginning of it."

"So?"

"They didn’t get buried like the first craters on Farside. They’re intact."

"Sure-but they won’t tell you anything new. They’re from recent impacts, same as everything that’s on the surface of Farside."

"But you said some of them showed radiation anomalies. That’s just what I want to know more about."

"But nobody ever found any suggestion of what you’re talking about."

"Maybe they weren’t looking for the right things. They never had any reason to."

The physics department had a comprehensive collection of Lunar rock samples, a sizeable proportion of which comprised specimens from the interiors and vicinities of the young, anomalous craters on Nearside. Under Hunt’s persistent coercion, Steinfleld agreed to conduct a specially devised series of tests on them. He estimated that he would need a month to complete the work.

Hunt returned to Houston to catch up on developments there and a month later flew back to Omaha. Steinfield’s experiments had resulted in a series of computer-generated maps showing anomalous Nearside craters. The craters divided themselves into two classes on the maps: those with characteristic irradiation patterns and those without.

"And another thing," Steinfield informed him. "The first class, those that show the pattern, have also got another thing in common that the second class hasn’t got: glasses from the centers were formed by a different process. So now we’ve got anomalous anomalies on Nearside, too!"

Hunt spent a week in Omaha and then went directly to Washington to talk to a group of government scientists and to study the archives of a department that had ceased to exist more than fifteen years before. He then returned to Omaha once again and showed his findings to Steinfleld. Steinfield persuaded the university authorities to allow selected samples from their collection to be loaned to the UNSA Mineralogy and Petrology Laboratories in Pasadena, California, for further testing of an extremely specialized nature, suitable equipment for which existed at only a few establishments in the world.

As a direct consequence of these tests, Caldwell authorized the issue of a top-priority directive to the UNSA bases at Tycho, Crisium, and some other Lunar locations, to conduct specific surveys in the areas of certain selected craters. A month after that, the first samples began arriving at Houston and were forwarded immediately to Pasadena; so were the large numbers of samples collected from deep below the surface of Farside.

The outcome of all this activity was summarized in a memorandum stamped "SECRET" and written on the anniversary of Hunt’s first arrival in Houston.

ANOMALIES OF LUNAR CRATERING

(1) Hemispheric Anomalies

For many years, radical differences have been known to exist between the nature and origins of Lunar Nearside and Farside surface features.

(a) Nearside

Original Lunar surface from 4 billion years ago. Nearly all surface cratering caused by explosive release of kinetic energy by meteorite impacts. Some younger-e.g., Copernicus, 850 million years old.

(b) Farside

Surface comprises large mass of recently added material to average depth circa 300 meters. Craters formed during final phase of this bombardment. Dating of these events coincides with Lunarian presence. Origin of bombardment uncertain.

(2) Nearside Exceptions

Known for approx. the last thirty years that some Nearside craters date from same period as those on Farside. Current theory ascribes them to overshoots from Farside bombardment.