Return to far (how-to)

The nearest [star] to [Sun|our sun] ([Sol]) is [Proxima Centauri]. It takes a [photon] of light from it 4.3 years to reach Earth, a [distance] of 5.88 million million miles. Imagine you decide to [walking|walk] to it. The average human walks at 3.1 miles per hour. Assume for the sake of this [thought experiment] that [time stops], all motion in the [universe] ceases. A bridge stretches between a station in our [solar system] and a station in the [Alpha Centauri] star system. The bridge has artificial [gravity] and is enclosed, pressurized, and filled with [Earth]-type [atmosphere].

1 [light year] is approximately 5.88 million million [miles].

There are 24 hours per day, 365.2425 days per year.

Distance to Proxima ÷ walking speed ÷ hours per day ÷ days per year = number of years.

4.3 × (5.88 × 1012) ÷ 3.1 ÷ 24 ÷ 365.2425 ≈ 930.5 million years, nonstop.

If you walk for only about 16 hours per day, taking breaks to eat and [sleep], it takes 3/2 more time, about 1,396,000,000 years.

Currently the average human [life expectancy|lifespan] in a [post-industrial] country is something like 82 years. The journey would take over 17 million lifetimes. Take every person in [Tokyo] and [New York City] and live each one of their lives one after the other, walking every day of their (your) lives. They (you) will have walked far enough to reach Proxima Centauri.