Reaching Proxima Centauri in 20 years, Breakthrough Starshot initiative.
Breakthrough Starshot is an initiative of a private foundation that aims to launch a tiny spacecraft, weighing just a few grams at a speed that would reach 20% of the speed of light, using a sail, the diagram is shown. The ship uses a light sail, a solar sail, the correct term, it would be better to say light sail because they work with light, what happens is that in space in the solar system what we have most of is sunlight.
Souce
The other problem they have is that they have no brakes, they would pass by, there is no way to stop them that would be the second problem and the third problem is the one that Avil Loeb and his colleagues have discovered with the research titled “the interaction of spacecraft relativistic with the Interstellar environment”, and even if it was small the ship would brush against so much dust, gas and molecules that it would end up destroyed.
The images without reference were created with AI