I’m wondering if interstellar travel is possible. So I guess the starting point is figuring out FTL travel.
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The heavier something is (or “the more mass something has”), the harder it is to make it move. It’s easy to move a marble but tough to move a boulder, right?
Light has *no mass*. This means that it moves as fast as is possible. Anything else with 0 mass would also move as fast as possible; there’s nothing specifically special about light here.
This also means that anything with mass – any amount of mass, at all – *can’t* move as quickly as light, because its own mass slows it down.
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