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Illustration Length contraction: Distance between 2 planets as seen by the spacecraft at rest

Length contraction: distance between two planets as seen by the spacecraft at rest
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Length contraction from the point of view of a spacecraft at rest \(B'\). From its point of view, the two planets (Earth and Alpha) are moving to the left with the velocity \(v\). The distance between the Earth and the planet Alpha is \( \Delta x' \). According to the clock inside the spacecraft the spacecraft needs the time \(\Delta t' \) to cover this distance.