American space scientists say they have discovered three new moons orbiting around the planet Neptune. Scientists at the Harvard-Smithsonian Center for Astrophysics in the northeastern state of Massachusetts announced the discovery. They found the moons by using two telescopes, one in Chile and one in the American state of Hawaii. They now say that Neptune has eleven moons. The new moons are the first to be found since nineteen eighty-nine. Each is between thirty and forty kilometers across.