Here's why:
* The Milky Way's size: Our galaxy is massive, spanning about 100,000 light-years across.
* Light's speed: Light travels at an incredible speed of about 300,000 kilometers per second (186,000 miles per second).
* Time = Distance / Speed: Since light travels at a constant speed, we can calculate the time it takes by dividing the distance by the speed. In this case, the time would be: 100,000 light-years / 1 light-year per year = 100,000 years.
Keep in mind that this is an estimate. The exact time might vary slightly depending on the specific path light takes through the galaxy.
