Top 10 cosmological discoveries

quasar 3C 273

Quasar 3C 273, shown here in an image from Hubble's Wide Field and Planetary Camera 2, was first identified in the 1960s by its radio signals. The unusually bright object is about 2.5 billion light-years away in the constellation Virgo. The detection of quasars comes in at No. 7 in the Top 10 cosmological discoveries.

ESA, Hubble, NASA

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