the orbits of binary stars
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Yes, the mass of a planet can be determined by observing its transit across a star. By measuring the duration and depth of the transit, scientists can calculate the planet's size and mass based on the gravitational influence it exerts on the star. This method is known as the transit method and is commonly used in exoplanet studies.
High mass.
Scientists determine the composition of a star by studying its spectrum, which is produced by analyzing the light emitted by the star. By examining the absorption lines in the spectrum, scientists can identify the elements present in the star's atmosphere and infer its overall composition. Additionally, measurements of the star's temperature, luminosity, and mass can also provide valuable information about its composition.
The mass of a star can be determined from a binary star system, specifically by measuring the orbital motion and interaction between the two stars. This allows astronomers to apply Kepler's laws of planetary motion to calculate the masses of both stars in the system.
Vega is just over twice the mass of the Sun.