The evening fire burned steadily.
Mr Blottisham was reading an article in an astronomy magazine with increasing concentration.
At length he looked up.
"I've been thinking about dark matter."
Professor Quillibrace looked mildly surprised.
"How very cosmological of you."
"It seems to make up most of the universe."
"So one often reads."
"And yet..."
"...yes?"
"...nobody appears to know what it is."
Quillibrace smiled.
"An excellent beginning."
Miss Elowen Stray laid aside her knitting.
"I wonder whether that is the first question we should ask."
Blottisham frowned.
"What could be earlier than asking what something is?"
"What made anyone think of it at all?"
Quillibrace nodded approvingly.
"Tell me, Blottisham."
"Yes?"
"Did astronomers discover dark matter?"
"Surely they did."
"What did they actually observe?"
Blottisham hesitated.
"Galaxies."
"Indeed."
"What about them?"
"They rotated..."
"...yes?"
"...rather unexpectedly."
"And galaxy clusters?"
"They seemed too massive."
"And gravitational lensing?"
"It suggested more gravity than visible matter could explain."
Quillibrace smiled gently.
"So they discovered..."
Blottisham stopped.
"...a problem."
For a moment no one spoke.
The fire shifted softly.
Miss Stray broke the silence.
"A problem is not yet an explanation."
"No."
"It merely changes the questions."
Quillibrace leaned back.
"What possibilities suddenly became available?"
Blottisham counted carefully on his fingers.
"The observations might be mistaken."
"Quite."
"Perhaps there was ordinary matter we couldn't see."
"Indeed."
"Perhaps gravity itself required modification."
"Very good."
"Or..."
"...yes?"
"...there might be an entirely new form of matter."
Quillibrace inclined his head.
"One possibility among several."
Blottisham looked thoughtful.
"But that isn't how people speak now."
"No?"
"They speak of dark matter as though it were already part of the furniture of the universe."
Miss Stray smiled.
"The brass plaques again."
Quillibrace laughed quietly.
"Precisely."
Blottisham looked pleased.
"So we've found another ontological escalator."
"We may have done."
"The language became more confident."
"Because the explanation became more successful."
"But success..."
"...yes?"
"...is not quite the same thing as certainty."
They sat quietly for a while.
Outside, twilight was settling over the college gardens.
Miss Stray looked towards the old oak.
"I've noticed something."
"What is it?"
"When a tree thrives..."
"...yes?"
"...it doesn't merely become taller."
"No."
"It produces branches."
Quillibrace smiled.
"And dark matter?"
"Has done exactly the same."
Blottisham looked puzzled.
"I don't follow."
"It began as one proposal."
"Yes."
"Then came WIMPs."
"Indeed."
"Axions."
"Quite."
"Sterile neutrinos."
"Yes."
"Primordial black holes."
"And many others."
Blottisham laughed.
"So the theory has become rather a large tree."
"Not merely a tree," said Quillibrace.
"An orchard."
Miss Stray looked amused.
"Some trees will flourish."
"Indeed."
"Others may fail."
"Quite."
"But planting many varieties is not evidence that the gardener is confused."
"No?"
"It is evidence that the soil has proved fertile."
Blottisham sat silently for a long moment.
"I think I understand."
"Do you?"
"We often ask whether dark matter exists."
"A natural question."
"But perhaps an earlier question is..."
He searched for the words.
"...what work the idea has been doing."
Quillibrace's expression brightened.
"A considerably earlier question."
Outside, the gardener was inspecting several young saplings planted the previous spring.
One had grown vigorously.
Another appeared unlikely to survive.
A third had produced unexpected shoots.
Miss Stray watched them carefully.
"The gardener doesn't yet know which trees will shape the avenue."
"No."
"But he already knows..."
"...yes?"
"...that the planting has changed the future of the garden."
The college clock struck eight.
Blottisham closed the magazine.
"I began the evening wondering whether dark matter was real."
"And now?"
"I'm more interested in how it became possible."
Quillibrace smiled.
"My dear Blottisham..."
"Yes?"
"I suspect you have been paying rather more attention than you realise."
The three scholars rose.
Outside, the young trees stood quietly in the gathering darkness.
Whether each would flourish, fail, or transform the garden in ways no one yet anticipated remained unknown.
Yet their presence had already altered what the gardeners could imagine planting next.
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