'Are you missing the point or deliberately avoiding it?' Harry wanted to know. This is my question: if a black hole goes somewhere, emerging maybe light-years away, what of the space in between? Where is the material which is drawn into the hole, between its disappearing and its reappearing? You see, to me this all seems very much like our Mobius Continuum.'
'Go on,' Mobius was fascinated.
'OK,' said Harry, 'let's look at it this way. First we have the ... let's call it the mundane universe. And we'll say it looks like this:'
He showed Mobius a mental diagram.
'Why the bends?' the mathematician was immediately curious.
'Because without them it would just be a pair of straight lines,' Harry told him. 'The bends give it definition, make it look like something.'
'Like a ribbon?'
'For the purpose of the exercise, why not? For all I know it could be a circle, or maybe a sphere. But this way we can envisage a past and a future, too.'
'Very well,' Mobius conceded.
'Now in this diagram of the universe,' Harry went on, 'we can't go from "A" to "B" without crossing the edge. We can go up the ribbon from "A" to the edge, then down to "B". Or down to the edge and up, it makes no difference. The edge represents the distance between "A" and "B", right?'
'Agreed,' said the other.
'Now this is how I see the Mobius Continuum,' said Harry:
And he continued: 'It's the ribbon universe we know with the half-twist of your Mobius strip. "Now" has turned through ninety degrees to become "forever". Which means that "A" and "B" are now on the same plane. We no longer have to cross the edge. We can go from one to the other instantaneously - "now"!'
'Go on,' said Mobius again, but much more thoughtfully.
'Previously we've thought of it like this:' said Harry. 'Like... like putting on a pair of seven-league boots and striding to our destinations in seconds. Covering distances that should take hours in minutes. But I've checked it out and it's not like that. In fact we go there instantaneously -accordingly to Earth-time, anyway. It's not simply that we go there faster, but that the space in between actually disappears!'
After a little while Mobius said, 'I think I understand. What you want to know is this: if for us the space between "A" and "B" reduces to zero - if it disappears - '
'Exactly!' Harry cut in. 'Where does it go to?'
'But it's an illusion,' Mobius cried. 'It's still there. It's we who have disappeared - into the Mobius Continuum, as you insist upon calling it!'
'Now we're getting somewhere,' Harry took a deep breath. 'You see, the way I see it, the Mobius Continuum is no-man's-land, it's limbo, it's the middle ground between universes. "Universes" - plural! It has doors to the past, the future, and to every point in present time. Using it, we can go every-where and -when - or at least I can, because I still have a life-thread to follow. But the point I'm trying to make is this: I believe there may be other doors which we haven't found yet. We don't have the equations for them. And I believe that one of those doors, when I find it, will - '
' - Lead you to your wife and son, and to Michael J. Simmons?'
'Yes!'
Mobius nodded (in his fashion) and gave it some thought. 'Other doors,' he mused. Then: 'Grant me this -that I know more about the Mobius dimension than you do. That I have had one hundred and twenty years to examine it more thoroughly than you could ever hope to. That I discovered it, and have used it to go places you can never go, not in your lifetime.' 'Oh?' said Harry.
'Oh?' Mobius raised his eyebrows again. 'Oh? And can you go to the centre of a star in Betelgeuse to measure its temperature? Can you visit the moons of Jupiter or sit in the middle of that planet's monumental tornado which we call the Red Spot? Can you journey to the bottom of the Marianas Trench and every other deep on Earth to calculate the mass of water in this world? No, you can't. But I can - and have! Now grant me this: that I know the Mobius Continuum better than you do!'
When the point was made like that, there seemed little use in arguing it. Harry could only agree, but: 'I think you're going to tell me something I don't want to hear,' he said.
'You know I am!' Mobius told him. 'There are no other doors we haven't discovered, Harry. Not in the Mobius Continuum. Other universes? - which seems to me something of a contradiction in itself - I can't say. And in any case you're talking to the wrong man, for I only deal in the three-dimensional worlds we know. But of one thing I'm sure: you won't find your way into any parallel world through the Mobius Continuum...' He fell silent as Harry's disappointment swelled like a physical thing, until it hung heavy over Mobius's grave like a blanket of fog.
'Sir,' Harry finally said, 'I thank you for your time; I've already wasted far too much of it.'
'Not at all,' Mobius answered. 'Time is only important to the living. I have more than enough of time! I just wish I was able to help.'
'You've helped,' Harry was grateful, 'if only to settle a point I've argued with myself time and time again. You see, I know Harry Jnr and his mother are alive, and I know that he can use the Mobius Continuum maybe even better than we can. He's alive but not in this universe, so he must be in some other. There's no way round that. I thought he'd gone there, wherever, along the strip. You've assured me that he hasn't. So ... there has to be some other route. I already have a clue where to start looking for it, except... from here on in my work becomes that much more dangerous, that's all. And now-'
'Wait!' said Mobius. 'I've been considering your diagrams. Can I show you one for a change?'
'By all means.'
'Very welclass="underline" here's your ribbon universe again - and a parallel universe of a similar construction:'
'As you can see,' Mobius continued, 'I've joined them by use of - '
'A black hole?' Harry guessed.
'No, for we're talking about survivability. Nothing of solid matter and shape can enter that sort of awful maw and retain any sort of integrity. No matter what you are when you enter a black hole, you come out - if you come out - gaseous, atomic, pure energy!'
'Which cancels out white holes, too.' Harry was growing gloomier by the minute.
'But not grey ones,' said Mobius.
'Grey holes?' Harry frowned.
'... Yes, I see it now,' Mobius mused, almost to himself. 'Grey holes, without the disruptive gravity of black holes, and lacking the awesome radiation of white ones. Gateways pure and simple, between universes. Entropy radiators, perhaps? Inescapable once entered into, there would have to be more than one - if a traveller intended to make the return journey, anyway...'
Harry waited, and in a little while weird equations began flickering once more on that amazing computer screen which Mobius called his mind. They came faster and faster, calculi in endless streams, which left Harry dizzy as he tried to grasp their meaning. For seconds merging into minutes the mental display continued - only to be shut off, suddenly, leaving the screen blank. And in a little while longer:
'It is ... possible,' said Mobius. 'It could occur in nature, and might even be duplicated by man. Except of course that men would have no use for it. It would be a by-product of some other experimentation, an accident.'
'But if I knew how - if I could translate your math into engineering - you're saying I could manufacture this, well, gateway?' Harry was clutching at straws.
'You? Hardly!' Mobius chuckled. 'But a team of scientists, with enormous resources and a limitless energy supply - yes!'