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A laser strikes a piece of rock from another planet. The rock vaporizes, and the instrument catches the flying particles and sorts them by weight. That's how laser ionization mass spectrometry works — a method that could answer astrobiology's biggest question: is there life beyond Earth?

The instrument can peer inside a rock layer by layer, like an archaeologist brushing away layers of soil. It finds fossilized microbial structures hidden in the rock. It notices if sulfur in the sample has an unusual isotopic split — on Earth, that's often the handiwork of living organisms. And it recognizes organic molecules, the building blocks of life.

The real trick is in data processing. A mass spectrometer produces mountains of numbers, and the human eye can miss what matters. So scientists bring in machine learning: a neural network looks for patterns without being told what to find. This allows us to spot not only familiar forms of life but also those we can't even imagine.

The technology is already flight-ready. All that's left is a mission to carry such an instrument to Mars or the icy moons of Jupiter. The laser beam will become our probe in the search for cosmic neighbors.