Bizarre solar system crams three giant planets into fraction of Mercury’s orbit
The Kepler-18 system is one of the galaxy’s busiest places, with two Neptune-sized planets and a super-Earth orbiting around a single star. We know this, thanks to a bold new exoplanet-hunting technique that could help us find more Earth-like planets. The planets are designated Kepler-18 b, c, and d. Planet b is the closest, completing…
