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Tag: black holes

OJ287: A great test laboratory for relativity

November 23, 2017 Mark Kidger5 Comments

When, in 1968, the astronomers at the Ohio Radio Survey first detected a quite weak source at 1415 MHz, they little-realised its significance. It was catalogued as “OJ 287” – “O” for Ohio, “J” to indicate that it was between 8 and 9 hours Right Ascension[1], “2” because it was in the strip of sky [...]

Posted in CosmologyTagged black holes, quasars, Relativity

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