I think they might be thinking of the corona of the sun
> The temperature in the corona is more than a million degrees, surprisingly much hotter than the temperature at the Sun's surface which is around 5,500° C
> The temperature in the corona is more than a million degrees, surprisingly much hotter than the temperature at the Sun's surface which is around 5,500° C
With sufficiently efficient fuel, the fastest path from A to B is by constantly accelerating (more or less) towards it until you reach halfway, then flipping and constantly decelerating until you arrive.
Under this kind of trajectory, you're under constant acceleration of, say, 1g the whole time. This means you effectively have gravity for the entire trip, as long as you've designed your ship such that the floor is in the same direction as you apply thrust - think less traditional ship decks and more like a skyscraper.
Another realistic option, of course, is a rotating section. But this generally requires massive, "ugly" ships to work so it's pretty rare in fiction.