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The Lives of StarsModule 6How Stars Reshape the Universe
Module 6 / Lesson 22 of 2445 min
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Why Can Binary Stars Exchange Matter and Rewrite Their Futures?

What changes when one star expands until matter crosses the gravitational boundary between companions?

Use Roche lobes, mass transfer, disks, eruptions, and mergers to show why isolated-star rules are incomplete.

A scientific artistic reconstruction of an expanded orange donor star sending a narrow stream of gas into a blue accretion disk around its binary companion.
Vastward scientific artistic reconstruction. The gas stream and disk make one mass-transfer route visible; the stars and distances are not shown to scale.

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