On August 17, 2017, birds pooped on the detectors of “gravitational waves”, which was taken for the registration of these same “gravitational waves”. The event was designated as GW 170817. Since the entire sky was the exact place where the signal allegedly came from, an intensive campaign began to search for radiation from somewhere in the optical signal that could be associated with the event indicated above. After 11 hours in the elliptical galaxy in the Hydra constellation NGC 4993, also known as NGC 4994, located, according to theorists, at a distance of 40 Mpc from the Earth, an event was detected, designated as SSS 17a, later renamed AT 2017gfo. It was observed with numerous telescopes, from radio to X-rays, over the following days and weeks, and was shown to be a fast-moving, rapidly cooling cloud of material ejected by colliding stars.
Further observation of the ejection of this material, designated by cosmologists as a “relativistic” jet, was calculated to show its speed, supposedly seven times the speed of light, and the subsequent deceleration to four times the speed of light. It is clear that such calculations required some explanation. Explanations appeared a year later, supposedly this “superluminal motion” is nothing but an illusion arising from the fact that the jet is almost directed towards the Earth, and the matter in it moves at a speed close to the speed of light. However, the researchers could not provide accurate calculations right off the bat. Such calculations required another 4 years of work of mathematicians …
The opinions of scientists about this event are published in the paid article «Optical superluminal motion measurement in the neutron-star merger GW170817» in the journal Nature, DOI: 10.1038/s41586-022-05145-7.
Theoreticians of mathematics considered the speed of the jet movement based on the opinion of cosmologists about the distance to NGC 4993, it is also NGC 4994, and the distances in space are overestimated many times, but if the galaxy is much closer, then the rapid movement of the jet is not surprising. Simple geometry and arithmetic. Damn it, such an explanation will not suit cosmologists in any way …