'Ghosts of the radio universe': Astronomers have discovered a slew of faint circular objects
It's comprised of radio sources so faint they have never been seen before, each with their own unique physical properties.
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Images Show Entire "Universe" of Circular Structure That Can Only Be Seen as Radio Signals
Behold the mysterious objects populating the "low surface brightness universe" that the latest radio telescopes are beginning ...
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View line map: Strong solar flare may cause radio blackouts, northern lights visible in US
The sun unleashed a strong X2 solar flare on Sunday; the National Oceanic and Atmospheric Administration released an alert stating radio blackouts ... lights view line map for Monday, Feb. 23 ...