Question
What does it mean when an admission line I feel you from a Galaxy is shifted toward red the Galaxy contains a small percent of your hydrogen the Galaxy contains a large percent hydrogen in the galaxy is moving toward the viewer the gas is moving away from the door
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GPT-4o mini
When an emission line from a galaxy is redshifted, it means that the light emitted by that galaxy is exhibiting a shift toward longer wavelengths. This is generally interpreted as a sign that the galaxy is moving away from the observer, according to the Doppler effect.
Based on the options you've provided:
1. **The galaxy contains a small percent of your hydrogen** - This is not relevant to redshift. The composition of the galaxy does not directly explain the redshift.
2. **The galaxy contains a large percent of hydrogen** - Similar to the first point, while the presence of hydrogen may affect specific spectral lines, it doesn't inherently explain redshift.
3. **The galaxy is moving toward the viewer** - This is incorrect in the context of redshift. A galaxy moving towards the observer would exhibit a blueshift, which is a shift toward shorter wavelengths.
4. **The gas is moving away from the observer** - This is the correct interpretation of a redshift. If the emission line is redshifted, it suggests that the gas in the galaxy is receding from the observer.
In summary, when an emission line from a galaxy is redshifted, it generally indicates that the galaxy (or the gas within it) is moving away from the observer.
Based on the options you've provided:
1. **The galaxy contains a small percent of your hydrogen** - This is not relevant to redshift. The composition of the galaxy does not directly explain the redshift.
2. **The galaxy contains a large percent of hydrogen** - Similar to the first point, while the presence of hydrogen may affect specific spectral lines, it doesn't inherently explain redshift.
3. **The galaxy is moving toward the viewer** - This is incorrect in the context of redshift. A galaxy moving towards the observer would exhibit a blueshift, which is a shift toward shorter wavelengths.
4. **The gas is moving away from the observer** - This is the correct interpretation of a redshift. If the emission line is redshifted, it suggests that the gas in the galaxy is receding from the observer.
In summary, when an emission line from a galaxy is redshifted, it generally indicates that the galaxy (or the gas within it) is moving away from the observer.