Because we're creating a 95% confidence interval, this means we have two tails of 2.5%. When we look up 0.025 in the Z table (click to open) , we find that it corresponds to a z-score of 1.96. After plugging everything into the equation, we find a lower bound of 480.8 and an upper bound of 559.2.
As already noted, the speed of light (expressed in meters per second) means that light travels a distance of 9,460,528,000,000 km (or 5,878,499,817,000 miles) in a single year. This distance is known as a âlight yearâ, and is used to measure objects in the Universe that are at a considerable distances from us.
A light year is the distance light travels in one year. Works out to about 9 trillion kilometers. So 500 light years is 4500 trillion kilometers. Even if we could travel at just 1% of the speed of light (and we aren't even close to that) it would take 50,000 years to get there. Traveling at the speed of light, it would take 500 years. But NOTHING can go AT or FASTER than the speed of light. EVERYTHING must go slower, so it will take longer than 500 years. At one-half the seed of light it would take twice as long, or 1,000 years. at one-tenth the speed of light, it would take 5,000 years. But the fastest HUMANS can go is about 25,000 MPH.