Astronomers Use "Light Echo" To Measure Size Of Star's Disk
Scientists have used a rather novel technique to measure out the size of the major planet - forming saucer of junk and gaseous state surrounding a whiz near Earth . Using two telescopes , astronomer measured the fourth dimension it take for ignitor to travel from the wiz YLW 16B to Earth , and the time take for the “ echo ” of this luminosity to bounce off the disc ....