17. All stars and star clusters in the Milky Way orbit the centre of the galaxy, ---- A) yet a powerful gravitational force seems to come from the exact centre of the galaxy B) unless it appears as a broad, milky-looking band of starlight C) but a vast number of older stars are in the central bulge of the disk D) though much of the mass is concentrated toward the centre of the galaxy E) just as the planets in our solar system orbit the sun​