What information can astronomers infer by calculating the total mass of a galaxy using a rogue star?
Answer
The total gravitational mass including invisible dark matter
Measuring the speed of a star as it exits the boundaries of a galaxy is a powerful technique for calculating the galaxy's total mass. This calculation requires accounting for all sources of gravity, including the invisible dark matter halo that surrounds the galaxy. Since the star's escape trajectory is dependent on the total gravitational pull of the entire galaxy, observing these stars allows astronomers to derive the total mass, which is often significantly higher than what is visible through light alone.
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