The two so-called GW190521 black holes, one 66 times the mass of the Sun, the other 85 times the mass, merged to form the new massive black hole, the first time such large black holes have been observed either by gravity or by electromagnetic observations.
The 47-year-old building is the first modernist building in the city to receive official protection.
The information from the satellites could help scientists understand how elements are spread across the galaxy.
Discovered by an international team led by the Nicolaus Copernicus Astronomical Centre in Warsaw, the star named HD74423 is estimated to be 1.7 times the mass of the sun.
The object called 2020 CD3 and measuring just a few metres in diameter, entered Earth's orbit about three years ago. The ‘mini-moon’ circles the Earth every 47 days but is slipping from Earth’s gravitational pull and in few months will leave us.
The technique, which has already unearthed stars, allows scientists to see what is invisible.
The newly-discovered black hole, which researchers have called LB-1, is located 15,000 light-years from Earth and so far scientists have only known of black holes with masses below 50 times that of the sun.
If, as researchers believe, the 2l/Borisov comet comes from another galaxy this makes it a huge discovery: as the first comet from so far away and the second object from intergalactic space observed in the Solar System.
The team from the University of Warsaw say their unique map, which was based on observing 2,400 stars less than 250 million years old, is more accurate than models currently in use.
What started off as a hobby 15 years ago, last month turned into a fulltime business for the enthusiast.