👉 The term "isochrone" in astronomy refers to a point on a celestial trajectory where two stars of equal mass lie exactly along one line. This is the most direct path between them, and it's often used as a measurement of the distance between stars based on their luminosity. Isochrones are fundamental for understanding the evolution of galaxies, especially those within our own Milky Way galaxy. They show how star formation can be traced back to a common origin in the early universe, suggesting that this