Question
Which does the shift of the hydrogen absorption spectrum of a galaxy provide evidence for? Select the three correct answers.(2 points)
Responses
number of stars in the galaxy
number of stars in the galaxy
composition of the universe
composition of the universe
expansion of the universe
expansion of the universe
temperature of the galaxy
temperature of the galaxy
motion of the galaxy
motion of the galaxy
The Big Bang theory
Responses
number of stars in the galaxy
number of stars in the galaxy
composition of the universe
composition of the universe
expansion of the universe
expansion of the universe
temperature of the galaxy
temperature of the galaxy
motion of the galaxy
motion of the galaxy
The Big Bang theory
Answers
GPT-4o mini
The shift of the hydrogen absorption spectrum of a galaxy provides evidence for the following three:
1. **Expansion of the universe** - The redshift observed in the hydrogen absorption spectrum indicates that galaxies are moving away from us, supporting the notion that the universe is expanding.
2. **Motion of the galaxy** - The shift in the spectrum can provide information about the velocity and direction of a galaxy’s movement relative to Earth.
3. **Composition of the universe** - The absorption lines in the spectrum can reveal the presence of hydrogen and other elements, which helps in understanding the composition of the galaxy and, by extension, the universe.
The remaining options, such as the number of stars in the galaxy, temperature of the galaxy, and The Big Bang theory, are not directly indicated by the shift of the absorption spectrum.
1. **Expansion of the universe** - The redshift observed in the hydrogen absorption spectrum indicates that galaxies are moving away from us, supporting the notion that the universe is expanding.
2. **Motion of the galaxy** - The shift in the spectrum can provide information about the velocity and direction of a galaxy’s movement relative to Earth.
3. **Composition of the universe** - The absorption lines in the spectrum can reveal the presence of hydrogen and other elements, which helps in understanding the composition of the galaxy and, by extension, the universe.
The remaining options, such as the number of stars in the galaxy, temperature of the galaxy, and The Big Bang theory, are not directly indicated by the shift of the absorption spectrum.