they use huge rockets to escape Earths gravity, and then later just fly around near black hole and planets orbiting it, where time is slowed considerably because gravity, with tiny shuttle.

There will be plenty of articles written about the flimsy science of this movie.

But whoever wrote the notes for the pics above seems like the type of person who would be mystified by most science. And they seem to have swallowed the flimsy science of this movie hook line and sinker.