But only science fiction could get such a craft to Proxima b in less than many millennia. Artist’s rendering of an interstellar spacecraft leaving Earth. And even a craft too small to carry passengers might still be big enough to hold cameras that snap pictures of the new world. It might be possible, though, to send tiny spacecraft to Proxima Centauri much more quickly. Still, nobody onboard the ship when it departed would still be alive when it arrived. That’s much faster than other propulsion systems.
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The exact time would depend on how much weight was onboard compared with how much fuel the ship carried. In a scientific report about this plan, researchers from China say an alpha-powered ship could reach Proxima Centauri in 4,000 to 9,000 years.
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Eventually it might reach 200 to 300 kilometers (some 125 to 185 miles) per second. (In fact, you would have to shoot it into space to begin with, powered by an ordinary rocket.) But in space, with nothing to slow it down, the alpha ship would gradually gain speed.
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Those free to fly the other way (the exhaust) would drive the ship forward (via that opposite but equal reaction, again).īecause alpha particles are tiny, an alpha-powered ship would start out slow. So to power a ship, you would need a material that stops the particles flying off in one direction. It can be produced from other elements, however, by carrying out the right nuclear reactions.Īlpha particles usually fly off in all directions. Perhaps the best of these, uranium-232, is not found in nature. Some of them would be better than others. It comes in different forms, called isotopes.
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When an atomic nucleus spits out alpha particles, they can zip away 300 times faster than the exhaust of a plasma engine.īut to power a spaceship with alpha particles, you’d need a good supply of their radioactive source. Many unstable atoms produce a specific form of radioactivity known as alpha particles. That would make it a few times faster than the New Horizons probe.Īnother very new idea would use radioactive matter. Its exhaust could speed away at 50 kilometers (about 30 miles) per second. One plan to do that would use electrically charged atoms to create a plasma engine. (That’s Isaac Newton’s third law of motion.) To go forward faster, then, you need to expel your fuel’s exhaust faster backward. That propels the rocket forward because for every action there is an equal and opposite reaction. Rockets work by expelling their fuel’s exhaust behind the vehicle. Scientists do have ideas for building ships that could do better than those available today. In the background appear several stars further out in our Milky Way galaxy. The telescope created the X-shaped diffraction spikes surrounding the star. The star’s image, here, was captured by the Hubble Space Telescope. Light takes only 4.24 years to reach us from Proxima Centauri. Proxima Centauri, the closest star to our sun, is a member of the Alpha Centauri star system. But in real life, nothing can go faster than light, and the best rockets can’t even come close.
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In science fiction stories, of course, a warp drive or some other invention allows a spaceship to go faster than light.