I see we have a new tag, called no-ftl. This stands for "no faster-than-light [travel]", and indicates that nothing in the universe in question can travel faster than light. The tag is based off of the ftl tag, which stands for "faster-than-light".
Why not spell out the phrase "faster-than-light" ($\to$ no-faster-than-light)? Many people may not know what "ftl" stands for, and this would mean that the question wouldn't necessarily have to explain what "ftl" means. And for those who think that's a mouthful, just look at water-vessel-design - although I've suggested that it's unnecessary.
I don't think we need the tag no-ftl because I'd assume that faster-than-light travel doesn't automatically exist in a given world, and we can assume that, unless stated otherwise, it does not exist.
- We should either get rid of the tag entirely, or
- Spell out "no-faster-than-light"