Black Holes, by definition, cannot be seen because all which falls into them, including the light, is imprisoned. But the fast movement of gas close to a differently invisible object makes it possible to astronomers to calculate that it is a black hole, and also to estimate its mass.
There are another indices. The place of the black hole of apparent average weight coincides with a source of remarkable x-rays by the observatory of x-ray of Chandra. Black of the holes are known to create the intense emissions of x-ray while the gas whirls towards the interior and are overheated.
The observation of the sky holds an important role: If, by studying the orbit of star one locates inequalities (Irregular trajectory), we can then suspect that "avoid" something that we does not see!
If the object recently discovered, catalogued like GCIRS 13E, is indeed a black hole of average weight, it is probably of a rare variety, perhaps that of the kind; formed with the distance outside and finds itself in the galacticcenter. It is now with less than 1.5 light-years of fringes of the knownsupermassif black hole.
" It would allow the captain to navigate toward the sector where the singularity is weak," Burko said. "Experiencing only finite (and even small) effects (of stretching and squeezing), the spaceship could arrive at the singularity unharmed. While that still does not guarantee a peaceful traversing of the singularity, it keeps the possibility of doing so open. If that traversing becomes possible, it could open a 'tunnel' to another universe."