I'm playing my first game of Endless Space, and after exploring 4 or 5 systems around my home system, I seem to be out of places to go. I do see two other systems, but my scout refuses to travel to them. They've got wavy lines connecting them instead of the usual solid ones, so maybe it means I need some sort of special tech to be able to travel there?

What do I need to do to be able to explore those systems?
