This is episode Sixty of the novel, From Here To 1137 AD.

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A Man Without A Planet
Brain informed Tom that Gordon was approaching in a darter. Instead of instaporting aboard, Gordon used the docking station and attached the darter to the pod.
Gordon walked up an aisle from the rear of the pod into the lounge.
“How are you?” Tom smiled. “It’s good to see you.”
“I’m doing well,” Gordon said. “And I know all about you. I understand you kept Thomas Bales from a sword fight with Bouchard and arranged for Bouchard to meet his demise. Mission accomplished. The Bales’ family lineage lives on, and Bouchard’s comes to an abrupt finish, mission accomplished.”
“I see you don’t have a model,” Tom pretended to look for something that Gordon might have with him.
“I wanted to speak personally,” Gordon said.
“Sure,” Tom said, “let’s sit. Would you like something to drink?”
“No, thanks,” Gordon said.
They sat in chairs across from each other.
“You have something troubling on your mind, don’t you?” Tom said.
“I do,” Gordon said.
“Don’t tell me I have to return to 1137 and fix something,” Tom said. “Did I mess something up?”
“You did fine,” Gordon said. “You made decisions that only confirmed you were the right person to entrust this pod to and the mission you just completed.”
“In a way,” Tom joked, “I hoped you were here to fire me.”
Gordon paused and moved around on his chair as if he were uncomfortable. He forced a friendly grin.
“What is it, Gordon?”
“There is no easy way to put this,” Gordon said.
“Well, put it in anyway you like.”
“You can’t return to your home,” Gordon said and stared at Tom.
“Did something happen to the farm?”
Gordon glanced away as if the words he needed were etched on the wall.
“Oh no!” Tom said. “You mean Earth, something has happened. Is there still life there?”
“No,” Gordon said, “nothing that drastic.”
“Then what?”
“Our enemies,” Gordon said, “those who are after us, they were able to cast a cosmic barrier around Earth.”
“Exactly what does that mean?”
“If anything approaches the barrier, our enemies will know, and know what it is,” Gordon said. “They will come immediately. That could bring dire consequences for Earth.”
“Is there any way I can return to Earth?”
“No,” Gordon said.
“Tell me more about this.”
“We are not sure of the strength of the cosmic barrier,” Gordon said. “At the least, they are notified. Or, and this is something we can’t be certain, the moment the pod touches the barrier, the pod and everything in it will be reduced to cosmic dust in an instant.”
“Gordon, I have a life to return to,” Tom pleaded. “I think that was a part of the deal.”
“You have no idea how much this bothers me to tell you this,” Gordon said.
“I thought it was beyond the realm of possibility,” Tom said. “You assured me that the galaxy I’m from was like a blind spot in the universe. That they would never find it. They did not even know of its existence. How did this happen?”
“I’m not holding anything back from you,” Gordon said. “We made a mistake. That’s it!”
“Mistake! How is that possible? You’re supposed to be so much more advanced,” Tom mocked. “You have computers that know everything. This is more than a mistake; it’s colossal incompetence.”
Gordon remained calm. “You are right.”
“I have plans. I have friends. I have a brother marooned on an island in the middle of the Atlantic. I have someone who loves me. I promised I would return. I have property. I have a life that I gave up to stop something in a distant galaxy that may or may not happen. How could I have been so stupid?”
“If we had any idea at all that this was going to occur,” Gordon said, “we would not have approached you. I would have never sent you anywhere.”
“What do I do? Where do I go? What is next?”
“We are working on several solutions,” Gordon said.
“I didn’t ask what you are doing,” Tom said.
“You can visit another galaxy and establish a life there until a solution is found,” Gordon suggested. “There are several planets that would be suitable for you.”
“Let’s not go there quite yet. You see, I’m curious,” Tom said. “I know I’m a mere twentieth-century farmer, but dumb it down for me. What solutions are you working on, if any?”
“Everything is in the formative stages at this point,” Gordon said.
“Translation to a farmer,” Tom said sarcastically, “you ain’t got a clue.”
“That’s not entirely true,” Gordon said. “A proposal has been made that a hole in the barrier might be made without disturbing its integrity and sending out a signal or alarm. Another possibility is that in the past we have been able to develop a cosmic residue that would render such a barrier ineffective, yet still send a signal that it is still operational and effective.”
“As fulfilling and reliable as a politician’s promise,” Tom said sarcastically. “Let me guess, I get to be the test dummy.”
“I sympathize with your frustration,” Gordon said.
“You have not one clue,” Tom said and turned away from Gordon. Never had Tom felt such revulsion. It was not so much directed at Gordon as to what he assumed was the hidden pathology behind the web that he found himself hopelessly entangled.
“Tom,” Gordon said sincerely, “if I had any twinge that something like this would have come along, I would have never been a part of this. Things not even conceived cannot be avoided. None of us was prepared for this.”
Tom turned back to face Gordon. His face seemed to melt into an everlasting sadness. “Gordon, what do I do? What does a man do when all his future is reduced to nothing and all purpose has been erased?”
“Tom,” Gordon said. “I know you. You will find all you need to get through this. Others are working beyond what you know.”
“I do believe you,” Tom said, “but that does little to change anything.”
“Find something to do,” Gordon said. “There are so many things to see that will enrich you.”
“You don’t seem to understand,” Tom said, “I don’t need enrichment, power, advanced knowledge, all the things you worship and hold dear. I just don’t need them. I want to return to my farm, plant, cultivate, and harvest. I want to see Debbie, marry her, and have children. The next glitch in the universe, find another chump. Come to think about it, why don’t you stick your neck out? Find yourself a project that will take you back in time and see how you do.”
Gordon stood and motioned to the rear of the pod. “I’m going to go now. I think it’s best I leave you alone for a while. I’ll be in communication and keep you up to date on any progress that’s being made.”
“Come to think of it,” Tom said, “our situations are the same. You and your friends cannot return to your planet. And you had to come back to a time and place…” Tom paused. “I had to maneuver events in 1137 to save Thomas Bales from the death by the sword of Drake Bouchard. And you came to now to save me from being killed before having offspring. How close am I?”
Gordon’s nod affirmed what Tom said. “And Edgar also.”
“Both our lives were in danger?”
“Yes,” Gordon said.
“Do you still have surnames in your time?”
“Yes,” Gordon said.
“And it is Bales?”
“Yes,” Gordon said.
“And I am your grandfather by how many generations?” Tom asked.
“Too many to count,” Gordon gave a slanted smile.
Tom stood and gripped Gordon’s hand.
“You track me, right?” Tom said.
“We do,” Gordon said.
“Good, I don’t want to get lost.”
“You’ve got Brain,” Gordon smiled.
“How long do things like this take?” Tom asked.
“It could be a long time before we can come up with a viable solution,” Gordon said. “A year or more. But we could get lucky and have something in a week or two.”
“Gordon, have a safe trip.”
“You too.”
Gordon walked back down the hallway. In the docking station, he climbed back into the darter and was soon many light-years away.
“Brain,” Tom said, “a lot of things are going to change around here.”
“Do I detect a bit of humor in your tone?” Brain said.
“You do,” Tom affirmed. “The first order of business is that the name of this pod will be Hubble.”
“A fitting name,” Brain said.
“Here’s a rather universal-like command,” Tom said. “For the time being, let’s make a sharp right turn and cruise for about ten days. We’ll see where we’re at then, and see what we can do.”
The Hubble streaked away into the distant cosmos at a speed greater than light. During the next twenty years, it traveled far. Tom had many experiences. He found no civilizations as advanced as the one that provided Hubble for him.