If we're going to travel to distant stars in a single lifetime, we'll need faster-than-light propulsion. For decades, research into superluminal travel called for massive amounts of hypothetical particles and types of matter with "exotic" physical properties — like negative energy density — which either couldn't be found, or are simply beyond our technological capabilities.

However, novel research found a way around this issue by building a conceiving of a new type of hyper-fast "solitons" relying on sources with only net-positive energies — capable of traveling at any speed — according to a recent study published in the journal Classical and Quantum Gravity.

This raises the debate about how to design an engine capable of supporting faster-than-light (superluminal) travel from science fiction to a plausible field of theoretical investigation.

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