Question

1. what can we learn about stars and galaxies from using the doppler effect? explain how this is done

Explanation:

The Doppler Effect is used to determine the motion of stars and galaxies. By analyzing the shift in the wavelength of light (red - shift or blue - shift), we can tell if they are moving away from or towards us, respectively. Astronomers measure the spectral lines of light from celestial objects. If the lines are shifted towards the red end of the spectrum, the object is receding (cosmological red - shift for galaxies indicates the expansion of the universe). If shifted towards the blue end, the object is approaching. This helps in understanding the kinematics and dynamics of stars and galaxies.

Answer:

We can learn the motion (recession or approach) of stars and galaxies from using the Doppler Effect. This is done by analyzing the shift in the wavelength of the light they emit. A red - shift indicates they are moving away and a blue - shift indicates they are moving towards us, by measuring the spectral lines of the light from these celestial objects.