Explain Top 10 cosmological discoveries..
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Cosmic microwave background radiation. ...
The universe is expanding. ...
Organic molecules on comets. ...
The prevalence of dark matter. ...
Black holes. ...
Stars are powered by fusion. ...
Exoplanets. ...
Water on Mars.
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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.
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