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The Galactic Barrier in Star Trek Discovery
The concept of the galactic barrier is that there is a phenomenon at the edge of our galaxy, which it's been roughly described in across multiple series as something that prevents signals from getting through. "I actually had a plan to suggest an idea to Erin about how to clean up a little bit of the galactic Barrier stuff," says Trek creator Gene Roddenberry. But yes, I'm glad China made the point. You can see past and outside our galaxy that is that is key to astronomy and something that's used all the time.