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Posts Tagged "extragalactic astronomy"

Observations

Quasars at 50: Luminous Cosmic Beacons Remain a Puzzle

Quasar 3C 273 with jet

Fifty years ago, in the journal Nature, astronomer Maarten Schmidt published a brief paper noting that a star-like object known as 3C 273 was simply too far away to be a star in the Milky Way. Schmidt, of the California Institute of Technology, concluded on the basis of spectroscopic observations that the object was most [...]

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