i think we don't... how can you argue on this planet? it's relative as einstein told us.. so because the universe is expanding at the speed of light and you move 5km/h on earth, this doen't mean u travel faster than light...
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it is true but there is another experiment you can do. When you look at the horizon, eg the sun setting or rising you are looking into the past. the rate of acceleration from your perception is different even though the sun is just sitting there.