Question

"what if a galaxy was not tilted but was positioned toward us perfectly face-on, so stars in the galaxy are neither approaching nor receding from us, from our point of view. would the tully-fisher technique work?

Answer 1

yes

Step-by-step explanation:

Because no matter what we are gonna be on a sphere so there is no telling.

Answer 2

No, the Tully-Fisher technique wouldn't have worked in such a scenario.

Step-by-step explanation:

• For the Tully-Fisher technique to work, it is required that our view of the stars allows us to read their motion.

• If a galaxy would be in a position facing perfectly towards us, it would've been impossible to read whether the galaxy is moving towards us or away from us.

• In that case, the Tully-Fisher technique would fail and our distance from the galaxy would be incalculable.