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These observations will also be the sternest test yet of Einstein's general theory of relativity, which predicts the existence of black holes. If relativity breaks down, Doeleman and his team might not see a black hole at all, but something even stranger.
What we do know for sure is that something big lurks at the centre of our galaxy - because its powerful gravity affects the motion of nearby stars and gas. That something is about 4.5 million times the mass of the sun and crammed into an area the size of the inner solar system. There are few obvious ways to pack stuff in so tightly. Four million suns would be a dead giveaway, for instance. A swarm of neutron stars or small black holes would be highly unstable. So our best bet is one massive black hole.