He invented the compound pendulum, which moves in a cycloid arc, calculated the distance of Sirius by assuming  it had the same brightness as the sun, and discovered Titan in the course of his observations of SaturnÕs rings.
He was convinced that life existed on other planets, and wrote a book detailing the engineering feats of the people of Jupiter and Saturn. He invented the compound pendulum, which moves in a cycloid arc, calculated the distance of Sirius by assuming  it had the same brightness as the sun, and discovered Titan in the course of his observations of SaturnÕs rings. FTP, name this physicist, who published his wave theory of light in 1678, describing light as a vibration propagating through an ether of par  ticles.
He was convinced that life existed on other planets, and wrote a book detailing the engineering feats of the people of Jupiter and Saturn.
Christian Huygens