19. Which Country Astronomers discovered 1st Known Quadruple Asteroid System? A.JapanB.ThailandC.ChinaD.South Korea
Explanation: A Team of researchers from Thailand and France led by Anthony Berdeu of the National Astronomical Research Institute, Thailand has discovered a third moon (130 Elektra) orbiting the main-belt asteroid Elektra, which already has two moons in its orbit.
