 In 2,000 years, you can get to the Milky Way. And 90 billion years, you get to the edge of the observable universe. Now, where I stole this from, some guy who's really smart posted this, and I agree 100%. He said, you have to divide the 90 in half, meaning the 90 billion year trip to the edge of the universe. He said, it's the measurement of the diameter of the known universe. You need the radius to be accurate. He's correct.