Stellar Horizons: Double-Slit Experiment

Margarita is your Student Ambassador in Greece, leading a series of articles about Aerospace Engineering as part of her leadership project.

…Sarah’s story continued…

Sarah barely had time to understand what had just happened. One moment, she had passed through the impossible barrier. The next reality seemed to…hesitate. The space around her flattened.

Not empty, not vast, structured. Ahead, two narrow openings appeared in a thin, endless wall, perfectly cut, side by side. Behind the wall stretched a glowing surface, like a canvas waiting to be painted on. The particles reappeared around her, quieter now.

“Where are we?” Sarah asked.

The blue particle drifted forward.

“Now where, how?”

The yellow one shimmered and in a playful voice said

“This is a question, not a place!”

Sarah frowned. “That doesn’t make sense…”

“You will see, it will,” said the purple one.

A single particle of light appeared beside her. Small. Bright. Almost nervous. The light particle moved forward, as it approached the wall…something strange happened. It blurred.

“Wait…where is it?”

The particle was now longer, a single point. It spread, like waves. Like it existed in many places at once.

Then it reached the slits. And instead of choosing, it didn’t; it passed through both. At the same time.

The canvas behind the wall began to glow, lines forming, bright and dark bands, repeating, stretching outward in a perfect rhythm.

“It behaved like a wave”, Sarah whispered.

“But it’s a particle!”

“In our world… it doesn’t need to choose what it is.” Said the blue particle.

Sarah stared at the pattern; it was beautiful, like ripples in water overlapping, strengthening, and canceling each other out.

“What if we watch it? See which slit it actually goes through” Sarah said.

For the first time, the particles hesitated. Then slowly, a faint glow appeared near the slits.

An observer. A presence. Watching.

Another particle approached. It moved forward, staying whole, not blurring. It reached the slits and chose one…just one. On the canvas, the pattern changes, no more waves, just two simple clusters.

“It changes,” Sarah whispered.

“You asked reality a question… and it answered differently.”

And for the first time, she wondered, not where she was going next, but whether her path was already decided, or still spreading out, like a wave, waiting to be seen.