How a high-tech sling could propel us to the nearest star
In short: Traditional rockets are trapped by a physics paradox: they must carry the fuel needed to move their fuel. To reach Proxima Centauri, we need a radical departure from combustion. A new concept uses sunlight and a spinning carbon ribbon to fling tiny probes into the void, mimicking one of humanity's oldest tools.
The primary obstacle to interstellar travel is the 'tyranny of the rocket equation.' Because every kilogram of propellant requires additional propellant to lift it, chemical rockets are fundamentally inefficient for the vast distances between stars. For context, Voyager 1 travels at roughly 38,000 mph, a speed that would require approximately 75,000 years to reach Proxima Centauri, our closest stellar neighbor located 4.22 light-years away.
A proposed solution is TARS (the Torqued Accelerator using Radiation from the Sun). Unlike traditional rockets or massive fusion engines, TARS is an ultra-light carbon ribbon designed to stay close to the Sun. It uses sunlight to gradually build rotational energy. Once it reaches its structural limit, it releases a tiny payload from its spinning tip, functioning like a high-tech sling. Measuring just 3.5 pounds, the primary model created by Kathryn Lampo and David Kipping employs carbon nanotube sheets alongside nanostructured silver coatings.
While the basic TARS model would only reach speeds of 40 km/s—about 2.5 times the speed of Voyager 1—it represents a shift in strategy. Instead of building massive ships, it focuses on sending low-cost, tiny probes. This approach aims to bypass the need for hundred-gigawatt laser arrays or complex fusion systems, potentially making the first data from an alien world like Proxima b more economically viable for humanity.
This pursuit of interstellar reach is already gaining momentum. The Breakthrough Starshot project, backed by $100 million from Yuri Milner, is actively accelerating research into probes capable of making this journey. By combining ancient mechanics—the sling—with modern nanotechnology, scientists hope to finally bridge the gap between our solar system and the stars.
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Sources
- Summary by Intellect · source: We Can Reach Proxima Centauri Without Fuel
- Also: What It Would Take to Reach the Stars
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