英语翻译1.a star is 10000 light years away from Earth.How fast m

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英语翻译
1.a star is 10000 light years away from Earth.How fast must a spaceship go for a 30 years old astronaut to get there before the age of 55?
2.Light travels a certain distance in,say,10000 years.Can an astronaut travel more slowly than the speed of light and yet travel the same distance in a 10-year trip?Explain.
3.Can you get younger by traveling at speeds near the speed of light?Explain.
4.Joe Burpy is 30 years old and has a daughter who is 6 years old.Joe leaves on a Greyhound space bus and takes a 5-year(space-bus time) round-trip at 0.99c.How old will he and his daughter be when he returns?

1 .一个恒星距离地球是10000光年.宇宙飞船必须在多快的速度到达,在一个三十岁的宇航员还没到55岁前?
2 .光行走在一定的距离--10000光年.宇航员可以以比光速还慢的速度行走吗?,还能行走在同样的距离在十年内吗?解释.
3 .你可以变年轻吗,以接近光速的速度?解释.
4.Joe Burpy是30岁和有一个女儿6岁.Joe开着灰狗空间巴士,并考虑5年（空间巴士时间）往返于0.99c .当他和他的女儿回来时会是几岁?

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