Answer:
Stellar disk: 185 ± 15 kly (kilo Langley/year)
Dark matter halo: 1.9 ± 0.4 Mly (mega light year) (580 ± 120 kpc)
Step-by-step explanation:
The Milky Way galaxy contains the sun and the planets orbiting around it. This galaxy also contains up to 400 billion stars. The stellar disk of this galaxy is between 170,000 to 200,000 light years which is equal to a diameter of 52 - 61 kiloparsec.
Its thickness is measured at 0.3kpc which is also equal to 1000 light years. Its mass is 890 billion to 1.54 trillion times the mass of the sun. Its size is second to that of the Andromeda galaxy.