WASHINGTON Three new planets, which orbit a star situated 73 light years away from the Earth, have been discovered using NASA's newest planet-hunting satellite, scientists say. Of the three new exoplanets, one is rocky and slightly larger than Earth, while the two others are gaseous and roughly twice the size of our planet, according to the study published in the journal Nature Astronomy. The new star system, called TESS Object of Interest, or TOI-270, is exactly what the Transiting Exoplanet Survey Satellite, or TESS, was designed to find, said researchers from the University of California, Riverside in the US. Not only is the smaller planet in the habitable zone—the range of distances from a star that are warm enough to allow liquid-water oceans on a planet—but the TOI-270 star is nearby, making it brighter for viewing. It's also "quiet," meaning it has few flares and allows scientists to observe it and its orbiting planets more easily. "We've found v...