Huge Cosmic Discovery Challenges What Defines A Moon

For ages, astronomers have categorized the skies into tidy buckets: stars, planets, and moons. However, a new object 71 light-years from us could completely disrupt that thinking.
A team of astronomers led by Kevin Hoy of Chile’s Universidad Diego Portales and the European Southern Observatory (ESO) has detected the first known “exosatellite,”

