You're absolutely right! The blue shift in the spectrum of the Andromeda Galaxy tells us something very important about its motion relative to Earth and the rest of the solar system:

Andromeda is moving towards us.

Here's why:

* The Doppler Effect: The blue shift in light from Andromeda is a result of the Doppler effect. This effect is similar to how the pitch of a siren changes as it moves towards or away from you. When a light source moves towards an observer, the wavelengths of its light are compressed, shifting them towards the blue end of the spectrum.

* Cosmic Motion: The blue shift of Andromeda's light indicates that the galaxy is moving towards our own Milky Way galaxy. This is a fascinating phenomenon, and scientists estimate that the two galaxies will collide in about 4 billion years!

It's important to note:

* Not just Earth: The blue shift is observed from all points within our solar system because the entire solar system is moving alongside Earth.

* Relative Motion: While Andromeda is moving towards us, it's not necessarily true that we are stationary. Both galaxies are likely moving within the larger structure of the universe.

The blue shift of Andromeda's light is a powerful confirmation of the expansion of the universe and the constant dance of galaxies within it.