ISTANBUL Scientists have detected the most massive black hole merger ever observed, following a collision between two giant black holes over 10 billion light-years from Earth, researchers announced Monday. Each black hole was more than 100 times the mass of the sun and spiraled into one another before merging into a new black hole estimated to be around 265 times the mass of our sun, according to data from the US-based Laser Interferometer Gravitational-wave Observatory (LIGO). “These are the