"Now, we've got this, what we call 'super massive black hole' at the centre of our galaxy and that actually plays quite an important role in holding our galaxy together because you've got this tremendous amount of mass there."
Sorry, this isn't right. The Milky Way's supermassive black hole's gravitational sphere of influence (where its gravity outweighs the gravity of the surrounding stars) is actually quite small compared to the size of the galaxy. The other stars in our galaxy's bulge have a far greater gravitational influence, and we haven't even gotten into the effect of dark matter in holding the galaxy together.
"Now, we've got this, what we
"Now, we've got this, what we call 'super massive black hole' at the centre of our galaxy and that actually plays quite an important role in holding our galaxy together because you've got this tremendous amount of mass there."
Sorry, this isn't right. The Milky Way's supermassive black hole's gravitational sphere of influence (where its gravity outweighs the gravity of the surrounding stars) is actually quite small compared to the size of the galaxy. The other stars in our galaxy's bulge have a far greater gravitational influence, and we haven't even gotten into the effect of dark matter in holding the galaxy together.