US made rocket propellers to power micro satellites. They have developed a micro rocket propeller that can power micro satellites weighing less than two kilograms. This thruster looks like a computer chip. It is composed of multiple layers of metal. The top layer has 500 metal tips evenly arranged. The bottom layer is equipped with a small liquid container. Each layer structure has tiny holes, which can "suck" the ionic liquid to the top metal needle Physics. The researchers designed a gold foil plate for the thruster. By applying a voltage, an electric field was formed between the gold foil plate and the metal tip, which caused the metal tip to release an ion beam, which pushed the microsatellite to run. According to calculations, in a zero-gravity environment in space, the thruster is enough to propel a satellite weighing about 0.9 kg. If equipped with multiple such micro-propellers at the same time, it will allow the micro-satellite to change its orbit, accurately turn, and roll normally. With the development of science and technology, micro satellites have begun to play an increasingly important role. Compared with larger artificial satellites, microsatellites are simple in design, versatile, and relatively low in development, launch, and operating costs. The microsatellites targeted by the Massachusetts Institute of Technology in this development usually do not exceed 1.4 kilograms. Most of them do not have a propulsion system and operate in fixed orbits. Generally, they will fall into the earth's atmosphere and burn out after completing a mission.
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