Spaceships and Lasers, What Could Go Wrong?

In order to see them at millions of kilometers away, they're actually going to have to be pretty bright. So I hope nobody's eyeballs and gets in the path of those lasers. We know that light gets bent by masses. As it goes by a huge blob of dark matter, for example, it can get lensed. Don't gravity also kind of affect time as well? Right? Like if you're near a black hole, time slows down and you'd actually kind of see light slowing down. There is a gravitational time dilation effect. If you're in an area with strong curvature, then clocks will run slower.