How a Beam of Pellets Could Blast a Probe Into Deep Space

If you want a spacecraft that can explore beyond the solar system—and you don’t want to wait decades for it to get there—you need one that can really move. Today’s chemical rockets and solar-powered probes are downright poky on interstellar scales. Artur Davoyan has a completely different idea for how to accelerate a spacecraft to extreme speeds: pellet-beam propulsion.

Here’s the gist of how it would work: First, you actually need two spacecraft. A probe blasts off on a one-way trip to deep space, while a second vehicle remains locked in an Earth orbit and fires thousands of tiny metallic pellets at its partner every second. The orbiting craft also either fires

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