First Exomoon Candidate is discovered by the astronomers The scientists used an innovative technique called gravitational microlensing. The technique takes advantage of chance alignments between stars: when a foreground star passes between us and a more distant star, the closer star can act like a magnifying glass to focus and brighten the light of the more distant one. These brightening events usually last about a month. If the foreground star has a planet circling around it, the planet will act as a second lens to brighten or dim the light even more. By carefully scrutinizing these brightening events, scientists can...