* The Speed of Light: Nothing with mass can actually travel at the speed of light. It's a fundamental limit in physics.
* The Size of the Milky Way: The Milky Way is enormous. It's estimated to be around 100,000 light-years across. A light-year is the distance light travels in one year, so even if you could travel at the speed of light, it would take 100,000 years to cross the entire galaxy.
Important Note: Even if we could travel at the speed of light, it wouldn't be a simple matter of "getting" to the Milky Way. We're already inside the Milky Way! We live on a planet orbiting a star within the galaxy.
Let me know if you have other questions about space and physics!