The system of Earth-Moon has five points of stability. They are the points where gravitational forces look to maintain the relative position of objects located out there. Two of those points are known as Lagrange points, L4 and L5. They form a triangle of having equal sides with the Earth and Moon and move around the Earth as the Moon moves along its own orbit. L4 and L5 points are not particularly stable. Nevertheless, they are considered to be the locations where interplanetary dust could settle in temporarily. Kordylewski observed two clusters of dust close to the L5 back in the year 1961. Several reports had surfaced since that time. Still, their faint looks made it really difficult to detect and so scientists had doubts over their existence.

Earlier this year, in a paper, a team from Hungary led by Gabor Horvath of Eotvos Lorand University, made a model of the Kordylewski clouds. Through the model, they wanted to assess exactly how they form and in what way they can be detected. They made use of polarising filters, which transmit light having a particular direction of oscillation. The light that is reflected always happens to be more or less polarised, depending upon the angle of reflection. The researchers set out to find the dust clouds. They had polarised the filer system that remains attached to a camera lens along with a CCD detector at the private observatory of Judit Sliz-Balogh in Hungary. The scientists managed to take exposures of the location of the Kordylewski cloud at the L5 point. The images, which they obtained, depicted light in a polarised manner reflecting from the dust.

Judit Sliz-Balogh said that The Kordylewski clouds are two of the toughest objects to find. Though they are at the same distance to Earth as they are to the Moon, still they are overlooked by the researchers in astronomy. It is quite fascinating to confirm that Earth does have pseudo-satellites carrying dust, in the orbit along with the lunar neighbor. Further research will take a look at L4 and L5 along with the associated Kordylewski, in order to understand how stable they are and if the dust poses any type of threat to equipment and astronauts in future.

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