Why can't I travel between these systems with wavy connecting lines?

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?

After playing a bit longer and unlocking some techs, I was able to answer this myself. It looks like those wavy lines represent wormholes, and you simply need the Applied Casimir Effect technology to traverse them.

After unlocking this tech, the wavy lines connecting the systems turned green and I was able to send my ships down them.