Massive black hole found by Finnish Astronomers

Astronomers from Finland have "weighed" a monster celestial object 18 billion times more massive than the Sun - six times larger than the previous record.

The black hole, known as OJ287, is orbited by a smaller black hole, which allowed its mass to be measured by analysing the orbit. The finding also enabled the researchers to test Einstein's theory of General Relativity for the first time in a strong gravitational field.

See BBC News.