What if a galaxy was not tilted but was positioned toward us perfectly face-on

Tully-Fisher Technique would not work

Explanation:

- The complete question is given in attachment

Solution:

- If the galaxy was positioned towards face-on and not tilted the gravitational attraction would cease. So the stars in galaxy would neither come closer or distance from us.

- This phenomenon would not cause a shift in wavelength/frequency and measurement of shift using Doppler's Effect is impossible as their no motion towards or away from us. Hence, the Tully-Fisher Technique would not work.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me