Searching for asteroids with solar plant technology.

What if I told you that a solar plant, even when shut down at night, could help save Earth from potential threats such as asteroids? This is already happening in the United States, where a bold scientist decided to give the giant mirrors of a solar power plant a new function: hunting for space objects in complete darkness, which could revolutionize both astronomy and planetary security.

At Sandia National Laboratories in New Mexico, scientist John Sandusky is using the National Solar Thermal Testing Center as a platform for an unusual experiment. where a 61-meter-high tower is surrounded by 218 heliostatic mirrors that normally concentrate sunlight to generate up to 6 gigawatts of thermal energy. However, at night, when power generation stops, those mirrors are literally left without a function.

That's when Sandusky had a brilliant idea: to transform that inactive structure into an asteroid tracker. Using a single heliostat, he programmed the mirror to move subtly, projecting starlight onto optical sensors mounted on the plant tower. The reflected energy was minimal, on the order of femtowatts, but sufficient to capture variations in the light spectrum.

These variations function as a kind of signature for objects moving in space, such as asteroids or even spacecraft, revealing their presence through subtle changes in the frequency of light crossing the field of view.

Unlike traditional optical telescopes that capture images with visible traces of asteroids in long exposures, Sanduskii's technique does not produce images. It analyzes the photocurrent with sub-millisecond precision, detecting tiny changes in the light pattern. This can indicate not only the presence of an asteroid, but also its angular velocity and direction, even without seeing a direct image. In addition to astronomical use, this approach could be adapted for military purposes; in theory, it could detect satellites or spacecraft operating secretly between Earth and the Moon.

A strategic and still poorly monitored region known as the Sis Lunar space, Sandusky believes the system could be expanded to use multiple mirrors simultaneously, increasing accuracy and coverage area.

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