"In 2015 gravitational waves were detected that resulted from a collision of supermassive black holes."
"The 2015 discovery was an event of another physical nature, much more powerful than the 2017 one, as it included the collision of supermassive black holes, each of the order of 100 millions of solar masses"
This is not true. GW150914 was from the collision of two black holes of ~30 solar masses each.
"The 2015 discovery was an event of another physical nature, much more powerful than the 2017 one, as it included the collision of supermassive black holes, each of the order of 100 millions of solar masses"
This is not true. GW150914 was from the collision of two black holes of ~30 solar masses each.