And it didn't get better when they got back to earth.

在他们返回地球以后，情况并没有好转。

And it didn`t get better when they got back to earth.

当他们回到地球时，情况并没有好转。

Also due to time dilation if you went on a mission in space going at the speed of light when you got back to earth your loved ones relative to you would have aged more.

另外，由于时间膨胀，如果你以光速在太空执行任务，当你回到地球时，你所爱的人相对于你来说会更老。