The explanation for Einstein's relativity: some stars die twice

The French magazine Le Point (Le Point) said that astronomers followed a star dying during a great explosion in 2016, and that the magic of space-time will make it possible to see again its amazing death in 2037.

The explosion is visible twice

The magazine confirmed that, despite the fact that it may seem to some as a science fiction, the astronomical community is currently preparing to see this same Big Bang repeated years after the first explosion.

According to a serious international study published in the British journal Nature Astronomy on September 13, the big explosion of the star that was observed during 2016, and was known at the time as the SN2016 explosion or "SN Requiem". (SN-Requiem), it will be visible again during the year 2037 elsewhere in the universe.

It should be noted here that the death explosion of the star when it was first discovered in 2016 was not only seen in one point in the universe, but was also available in 3 other locations.

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gravity lens

But how is this possible?

The multiplicity of these opportunities for astronomical vision is directly due to Albert Einstein's general theory of relativity, a translation of another theory known as the "gravitational lens" theory.

Concretely, if supermassive cosmic objects are capable of distorting spacetime, as an iron ball moving on an extended slab might do, then the path of each photon - that is, particles of light emitted during an event such as an explosion leading to the death of a star and which then travels in the The universe - subject to deviation from its course due to these distortions.

In the case of SN Requiem, the intense gravity of the MACS J0138.02155 galaxy cluster (which is the cause of the gravitational lensing phenomenon) shifted the curve of space-time to the point that the dying star's explosion light tilted toward us in different shapes and ways.

To approximate the picture, it is sufficient to imagine that several trains leaving the same station (the place of the explosion) are traveling at the same speed (the speed of light) in the same direction (towards the Earth), but they are traveling on different paths, in order to understand that these trains (such as the photons emitted from the Big Bang) will not You arrive at the same time and not to the exact same place.