Why do scientists observe blueshift in certain stars?(1 point)
Responses
Light wave frequencies increase as an object moves toward the observer.
Light wave frequencies increase as an object moves toward the observer.
Stars with lower temperatures emit more light waves at the blue end of the spectrum.
Stars with lower temperatures emit more light waves at the blue end of the spectrum.
Stars with higher temperatures emit more light waves at the blue end of the spectrum.
Stars with higher temperatures emit more light waves at the blue end of the spectrum.
Light wave frequencies decrease as an object moves toward the observer.
The correct answer is: Light wave frequencies increase as an object moves toward the observer.
The correct answer is: Light wave frequencies increase as an object moves toward the observer.
The correct answer is: Light wave frequencies increase as an object moves toward the observer.
When scientists observe blueshift in certain stars, it means that the light waves emitted by those stars have a higher frequency than when they were emitted. This happens when the star is moving towards the observer. As the star moves closer, its motion compresses the wavelengths of the light waves, resulting in an increase in frequency. This increase in frequency causes the light to shift towards the blue end of the spectrum.
To determine this, scientists study the spectrum of light emitted by stars using a technique called spectroscopy. They analyze the pattern of spectral lines in the light to identify any shifts towards the blue end of the spectrum, indicating blueshift. By measuring this shift in frequency, scientists can determine the speed and direction of a star's motion relative to Earth.