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For centuries, the reflections of light or sound have been theorized. Scientists have always thought of another variable: that of time. Many claim that temporal reflections are possible, since a wave (such as light or sound) can change direction and be reflected in time, instead of doing so in space. A theory in the purest 'Interstellar' style.
At this point, and to understand it simply, it is necessary to define spatial reflection. This occurs when a wave hits an object, bounces off and changes direction. Let's take a simple example: if we put a mirror to light or sound against the wall, both waves will bounce to other places. Well, now scientists argue that there is temporal reflection.
Difference between temporal and spatial reflection
To understand it, in temporal reflection the direction of the wave does not change, but its composition does. Let's take a simple example for this case: imagine throwing a stone into a lake. Normally, wave-like vibrations are formed in the water and, in addition, a sound is emitted when it hits the water (spatial reflection). Temporal reflection indicates that when the stone hits the water, the density of the water would change, making it much thicker.
Scientists at the Advanced Science Research Center at the City University of New York's Graduate Center (CUNY ASRC) have succeeded in observing these waves of temporal reflection after sending broadband signals to a metal strip with electrical switches. In turn, these switches were connected to capacitors
"It is very difficult to modify the properties of a medium quickly enough, uniformly and with sufficient contrast to reflect electromagnetic signals in time, as they oscillate very quickly," says Gengyu Xu, one of the authors of this scientific feat.