Multiple star systems are very common in the Milky Way. While most of these systems are binary systems consisting of two stars, others contain three, four, or even six stars.
These systems tend to be pretty stable since unstable systems tend to break apart or merge fairly quickly, but sometimes you can get a kind of meta-stable system. One that lasts long enough for stars to evolve while still being stable in the end. And that end could be a supernova.It all comes down to gravitational dynamics. In Newtonian physics, two orbiting masses in isolation are always stable. The only paths they can have are elliptical orbits.
These models are so accurate that they'll make good predictions across millions of years. This leads us to an interesting star system known as HD 74438. As the stars orbit around each other, each star's spectra Doppler shifts slightly because of their relative motion. So we can calculate their motion and speed.a team used ground-based spectroscopic observations of HD 74438 to pin down the orbits of the four stars.
Given enough time, the stars are likely to end their lives as white dwarfs. And since the gravitational instability of the system is small, the stars could live long enough to become white dwarfs. But their orbits would still be unstable, and that could cause them to collide in the end.
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