Assertion: black hole | /r/HasProperty | believed
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Source sentences:
text: Its not the only time a black hole is believed or known to have been ejected from the centre of the galaxy, in 3c 186, the supermassive black hole has been seen to be off-centre which further analysis showed that the reason for the move was because of gravitational influences of another black hole pulling on it.
text: It is believed that supermassive black holes exist in the centres of most galaxies, including the Milky Way.