Black hole theory

[Eno_Phmann]

We are told that there is a super massive black hole in the middle of our galaxy and that it makes no sense why the stars on the edge of our galaxy are moving as fast as they are. Scientists have recently seen stars that they believe are further away from us than should be possible to see. What if we are already inside the event horizon of our galaxy's black hole? It would explain why everything is red shifted.

[Eise]

Because all stars from the vantage point of a black hole would be blue shifted.

And not 'everything' is red shifted. This is for sure for many stars in the galaxy, and it is also true for galaxies that are relatively close by, which velocity to us is bigger than the expansion of the universe. E.g. the Andromeda galaxy and our galaxy are approaching each other, so Andromeda is also blue shifted from our view.

There is no need to come with fantastic propositions, where astronomy already has very viable theories. Dark Matter is still a kind of riddle, but we mostly postulate its possible existence from the movements of or in other galaxies, gravitational lensing, and the details of the Cosmic Background Radiation. If DM really is the answer to the 'anomalous' phenomena we observe is still an open question, but at least it would work as an explanation pretty well.

[SergUpstart]

42 minutes ago, Eno_Phmann said:

What if we are already inside the event horizon of our galaxy's black hole?

Your assumption is refuted quite simply. If the stars in our galaxy are inside the event horizon of our galaxy, then the stars in other galaxies would be inside the event horizon of their galaxy and we could not see them. However, this is not the case, with a powerful telescope we can see stars in other galaxies.

[Markus Hanke]

23 hours ago, SergUpstart said:

Your assumption is refuted quite simply. If the stars in our galaxy are inside the event horizon of our galaxy, then the stars in other galaxies would be inside the event horizon of their galaxy and we could not see them. However, this is not the case, with a powerful telescope we can see stars in other galaxies.

Good observation! +1

23 hours ago, Eno_Phmann said:

What if we are already inside the event horizon of our galaxy's black hole?

The other issue is that there are no stationary frames or stable orbits inside an event horizon - so we’d be spiralling into the center of the galaxy, which is not the case.