I guess hard is something inside the star where matter is compressed by gravity and fast is when you're accelerating matter. In the end it's the same, only you can't use gravity for small reactors to replicate star technology yet, so you must accelerate particles.
SciFi likes to talk about antigravitation. But supergravitation would be cool as well :)
SciFi likes to talk about antigravitation. But supergravitation would be cool as well :)