Is the Milky Way about 100000 light years across?

Yes, the Milky Way galaxy is approximately 100,000 light-years in diameter. This measurement encompasses the main disk of the galaxy, which contains stars, gas, and dust. However, including its halo of dark matter and outer regions, the total extent of the Milky Way could be larger, but the disk is commonly cited as around 100,000 light-years across.