When a planet with an atmosphere eclipses its star, light passes through its atmosphere and the molecules in the atmosphere will absorb specific frequencies of

When a planet with an atmosphere eclipses its star, light passes through its atmosphere and the molecules in the atmosphere will absorb specific frequencies of light. See https://exoplanets.nasa.gov/discovery/how-we-find-and-characterize/ https://exoplanets.nasa.gov/discovery/how-we-find-and-charac...