Spoiler alert: this article explains a key plot point, but we don't give away anything you won't see in trailers. Thanks to reader Florence, 7, for her questions.
Aldrin was able to return safely to his family, and the astronauts up in space now will too.Clearly, time dilation could have a serious cost. But it's not all bad news. Time dilation could one day help us travel to the stars.. Getting there is like traveling around the world one billion times. Traveling at an ordinary speed, no one would ever survive long enough to make the trip.
Time dilation, however, is also accompanied by another phenomenon: length contraction. When one travels very fast toward an object, the distance between your spaceship and that object will appear to be contracted. Very roughly, at high speeds, everything is closer together. This means that for someone traveling at a high speed, they could make it to the nearest star in a matter of days.
But time dilation would still be in effect. Your clock would slow relative to the clock of someone on Earth. So, you could make a round trip to the nearest star in a few days, but by the time you arrived home, everyone you know would be gone.
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