How to launch a spacecraft using a 30km space pendulum
In short: Imagine swinging a tether so long it stretches across the vacuum of space like a massive pendulum. In 2007, engineers attempted to use this 'slingshot' method to return a payload to Earth without burning a single drop of rocket fuel, creating the longest object ever deployed in orbit.
The YES2 experiment was designed as a radical alternative to traditional chemical propulsion. The plan involved deploying a 30-kilometer tether from a spacecraft and swinging it like a pendulum. By leveraging this mechanical motion, the mission aimed to swing a payload back toward Earth, effectively using kinetic energy instead of combustion to achieve orbital maneuvers.
While the concept remains a fascinating study in orbital mechanics, the outcome of the return phase remains a mystery; the fate of the specific return capsule from that 2007 experiment is currently unknown. This stands in contrast to more established 'gravity assists,' where spacecraft use the literal pull of a planet to gain momentum.
Modern missions like OSIRIS-REx and ESA's Juice utilize these gravitational slingshots regularly. For example, OSIRIS-REx used Earth's gravity to change its orbital plane by 6 degrees to reach the asteroid Bennu, gaining a velocity boost of about 8,451 to 8,500 miles per hour without using fuel. Similarly, Juice utilized an Earth flyby on September 28 to increase its speed by 3.5 km/s and shift its trajectory by 20 degrees toward Jupiter.
These maneuvers are essential for deep-space exploration because they allow spacecraft to perform massive orbital shifts that would otherwise exceed their total onboard fuel capacity. By 'stealing' a small amount of momentum from a planet, engineers can stretch the reach of our current propulsion technology.
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Sources
- Summary by Intellect · source: World's Largest Slingshot Threw A Spacecraft To Earth!
- Also: www.sciencedaily.com — ESA’s Juice just used Earth as a slingshot to Jupiter
- Also: Riding the Slingshot to Bennu - NASA Science
- Also: NASA’S OSIRIS-REx Spacecraft Slingshots Past Earth - NASA
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