The outermost ring of the planet Uranus turns out to have a bright blue color, according to a report in the April 7 issue of the journal Science. That makes it only the second blue ring to be found in ...

Call it the deep blue dot. For the first time, scientists have seen the visible color of a distant alien world. The exoplanet — called HD 189733b — is 63 light-years from Earth and a "deep cobalt blue ...

The planet HD 189733 b was discovered in 2005, as one of many huge gas worlds snuggled tightly against their suns. It gradually gained popularity for reasons that were not immediately apparent. It ...