New dynamical simulations suggest that the mysterious unseen world might be an interstellar rogue that was captured by our solar system. There are few solar system mysteries quite as compellin…
Tweet By Mike Wall SPACE.com 1-28-16 Gas-giant exoplanet orbits 600 billion miles from its host star, 175 times farther than Pluto is from the sun A huge alien world orbits 600 billion miles …