Chronospace
really is an amazing machine.” Benford took a final glance at the LM, then he pulled back the sleeve of his L.L. Bean parka, glanced at the Rolex on his left wrist. “But, hey, I don’t want to keep you. I know you’ve got to get back to work soon.”
    “No problem.” Murphy shook his head. “Really. I’ve done my last meeting for the day, and it isn’t like I’ve got to punch a clock.”
    “Yeah, but I’ve still got a plane to catch.” Benford nodded toward the nearby staircase. The field trippers were already scurrying upstairs, screaming with adolescent excitement, followed by their exhausted teacher. “We’d better hurry, if don’t want to get caught behind the rugrats. After you . . .”
    And so they marched up the four flights to the café, carrying on idle conversation until they reached the restaurant. The kids got there first, of course, but they were clustered outside, waiting for the rest of their group. Murphy led his guest past them into the cafeteria, and while they picked up plastic trays and began moving down the serving line, he told Benford about his work at the agency, how he had been hired to write summaries of current NASA science programs and expressing his frustration that it wasn’t the basic research for which he had been trained, his hopes that he might one day get transferred to Marshall or Goddard, or maybe even JPL in Pasadena. He even found himself talking about the irritation of having to take the Metro to work today before he realized that this probably wouldn’t interest anyone.
    For his part, Benford kept his silence, listening attentively yet nonetheless remaining laconic. He said that he was writing a nonfiction book titled Deep Time, but he didn’t say much of what it was about, and he casually mentioned his involvement in a TV miniseries about a Mars colony, yet he distracted himself by asking for Italian dressing to go with his garden salad when Murphy pressed for details. After a while, Murphy came to the conclusion that Greg was better at listening than talking. So much the better; during his tenure at NASA, he had met far too many egoists who could smother you with their bombast, and with far less justification.
    They took their trays to a table near the back of the room, where they hoped to avoid the noise created by forty children piling into the cafeteria. “So,” Benford said as he reached for the pepper shaker, “about this UFO article . . . what inspired you to write it?”
    Murphy shrugged. “Remember that piece in Analog a long time ago, ‘How to Build a Flying Saucer’?” Benford thought about it a moment, then shook his head. “Anyway, someone examined the reports about UFOs—their general appearance, how they fly, the electromagnetic disturbances they’re supposed to cause, so forth and so on—and wrote an article which explained them, more or less, on the basis of aeronautical science and known physics. I just took it a step further, really. Ask the next question, as Theodore Sturgeon used to say.”
    Benford speared a cucumber slice with his fork. “And what question was that?”
    “If we accept the premise that UFOs exist . . . just for the sake of argument . . . then we’ve got to ask where they come from.” Warming to the subject, Murphy ignored the cheeseburger growing cold on his plate. “The extraterrestrial hypothesis, of course, is the favorite explanation, but that falls apart when you look at it from a logical perspective. There aren’t any other planets in our solar system where intelligent life could have evolved, let alone atechnologically advanced race. The nearest habitable star systems are dozens of light-years away, so someone out there could conceivably have built starships to visit us, but any ship capable of travelling such enormous distances would have to be very large. The size of a small moon, really, if they’re reliant upon sub- c drives . . .”
    “Sub-c?” Benford shook his head. “I don’t

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