The interstellar spacecraft is moving towards the nearest star, located at a distance of L = 4.3 light years, at a speed of v = 1000 km/s. Having reached the star, the ship returns back. By what time Dt will the clock on the ship lag behind the clock on Earth when the ship returns to Earth? Note. Due to the high speed of the ship, the motion of the star relative to the Sun can be ignored.
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