Nearby star system's wobble was stellar activity, not a giant planet

A University of Michigan-led study has solved a 170-year-old puzzle about 70 Ophiuchi AB, a two-star system 16 light-years from Earth. A wobble once thought to signal a giant planet was instead caused by stellar activity. Jupiter-sized planets have now been ruled out in key regions, but smaller, potentially habitable worlds could still exist there.