Today, multiple space agencies are investigating cutting-edge propulsion ideas that will allow for rapid transits to other bodies in the Solar System.
Then there's Breakthrough Starshot, which proposes a 100-gigawatt laser array that would accelerate gram-scale nanocraft .
This mission concept could serve as a fast-transit interstellar precursor mission, like Starshot and Dragonfly. "In our case, the beam pushing the spacecraft is made of tiny pellets, hence [we call it] the pellet beam. Each pellet is accelerated to very high velocities by laser ablation, and then the pellets carry their momentum to push the spacecraft.
In addition, the small size and low mass of the pellets mean that they can be propelled by relatively low-power laser beams. Overall, Davoyan and his colleagues estimate that a 1-ton spacecraft could be accelerated to velocities of up to ~30 AU a year using a 10-megawatt laser beam.
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