Gravity-gradient stabilization (a.k.a. "tidal stabilization") is a method of stabilizing artificial satellites or space tethers in a fixed orientation using only the orbited body's mass distribution and gravitational field. The main advantage over using active stabilization with propellants, gyroscopes or reaction wheels is the low use of power and resources.
The idea is to use the Earth's gravitational field and tidal forces to keep the spacecraft aligned in the desired orientation. The gravity of the Earth decreases according the inverse-square law, and by extending the long axis perpendicular to the orbit, the "lower" part of the orbiting structure will be more attracted to the Earth. The effect is that the satellite will tend to align its axis of minimum moment of inertia vertically.
The first experimental attempt to use the technique on a human spaceflight was performed on September 13, 1966, on the US Gemini 11 mission, by attaching the Gemini spacecraft to its Agena target vehicle by a 100 feet (30 m) tether. The attempt was a failure, as insufficient gradient was produced to keep the tether taut.
An example of gravity-gradient stabilization was demonstrated during NASA's TSS-1R mission.[not in citation given] Just prior to tether separation, the tension on the tether was about 65 N (14.6 lbs).
See also 
- NASA on ATS-2
- Gunter's Space Page on ATS 2, 4 and 5
- A new kind of Earth Sensor using a proof mass on a MEMS created by EPFL students
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