Hubble has recorded matter that apparently exceeds the speed of light  

How is that possible;

After the collision of two neutron stars in 2017, matter was ejected into space which appeared to our eyes to exceed the speed of light by seven times! But as we know, such a thing is impossible with our current understanding of physics. “Superlight” speed is actually an illusion, which originates from the observer’s position. However, even when corrected for the speed of observation, the matter reached 99.97% of the speed of light at the time of its launch.

Hubble recorded the neutron star collision for 8 days and again 159 days after the collision. Combined with data from ESA’s Gaia satellite and several National Science Foundation radio telescopes, the researchers were able to create a type of measurement called Very Long Baseline Interferometry (VLBI).

So they found that ultraluminous motion takes place when something is coming towards us at a high enough speed, very close to our field of vision. As the object gets closer, the distance the light needs to cover becomes shorter. In this particular case, the matter moves almost as fast as the light it emits, creating the illusion that its light covers a greater distance than it actually does. So revealing the true speed requires precise data and complex calculations.

The Hubble data showed a superluminal speed seven times the speed of light. VLBI data collected 75 and 230 days after the collision showed the matter slowed to four times the speed of light, surprising scientists that Hubble’s accuracy is so close to powerful ground-based radio telescopes.

The research was published in Nature .