Instead of happily orbiting in circles with constant velocity, the two stars spend most of their time far apart, and a few harrowing hours racing past each other. Or, to put it another way: hours and hours of boredom punctuated by moments of sheer terror. This is a heartbeat star.
This paper seeks to provide a theoretical explanation for why gravitational perturbations do not disrupt the Keplerian orbits of Earth’s satellites.
This paper presents the first evidence of two distinct populations of pulsars, which the authors speculate stem from a difference in how they are formed.