Why does the rotation curve of the Milky Way imply the presence of dark matter? Group of answer choices Because we directly detected dark matter at the outskirts of the Milky Way using more sensitive telescopes and instruments Because the galactic halo has retrograde and prograde orbits Because the Milky Way would not rotate without any dark matter Because stars and ISM clouds orbit slower than expected from the visible mass in our galaxy Because stars and ISM clouds orbit faster in the outskirts, which can only be explained by the gravity of invisible mass