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A rogue planet the size of Saturn detected 10,000 light-years from Earth

Thanks to an enormous stroke of luck and serendipitous timing, astronomers were able to calculate the mass and distance of a ...
Scientific American

Scientists Just Clocked a ‘Rogue’ Planet the Size of Saturn

Astronomers just measured the mass of a free-floating planet without a star for the first time ...
SpaceNews

ALMA Measures Size of Seeds of Planets

Researchers using the Atacama Large Millimeter/submillimeter Array (ALMA) have, for the first time, achieved a precise size measurement of small dust particles around a young star through radio-wave ...
ExtremeTech

Astronomers May Have Underestimated the Size of Hundreds of Exoplanets

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New Scientist

A planet the size of Saturn could orbit the nearest sun-like star

A giant planet the size of Saturn orbiting a sun-like star has potentially been identified in our nearest neighbouring stellar system, Alpha Centauri. At just four light years from Earth, Alpha ...
Astronomy

Before spacecraft, how did astronomers determine the mass, size, and composition of the giant planets?

Planetary size was determined pre-spacecraft by measuring the planet's angular diameter and its distance from Earth (in AU, later converted to terrestrial units after the AU was accurately measured ...