The spiral galaxy rotation curves provide evidence for dark matter because ....

Question

Group of answer choices

The mass enclosed by the orbit keeps rising well outside the visible disk of the galaxy suggesting an extended dark halo

The rotation curve falls steeply with radius suggesting that most of the galaxy's mass is in the central supermassive black hole

They show that light is bent by the gravity of a large mass

Answer 1

The correct answer is:

The mass enclosed by the orbit keeps rising well outside the visible disk of the galaxy suggesting an extended dark halo