The sun is a black hole
Here is a theory which may or may not hold any truth.
Most things have an opposit or pair in nature, which creates a balance, which nature seems to like.
So light has dark, left has right,
The sun can be opposite end of a blackhole, so all the energy that is sucked into a black hole is then fed into the sun that then pours the energy out via, light, heat, radiation etc..
Now if the universe has another universe as a pair (parallel universe) a bright sun in our universe will present as a blackhole in the other universe. The other theory is that a sun and black black hole can be seperated by millions of miles but be conected via a breach in space/time so you can travel into a black hole in one solar system and then pop out of a sun in another solar system. Obv the craft would need sufficient speed and protection to do this if possible at all.