To everyone that says interstellar sci fi is silly fantasy, not speculative fiction, I give you this. Writers need to imagine beyond the limits of our current concepts of what is possible. Without science fiction writers willing to imagine the impossible, we would not have scientists willing to experiment with the idea of making it possible.
Sailing around the world was impossible. Flying was impossible. Breaking the sound barrier was impossible. Splitting the atom was impossible. Flying to the moon was impossible. Holding a computer in your hand was impossible. Sending a ship to Mars was impossible.
The impossible of yesterday is the ho hum ordinary of today. The impossible of today is the truth of tomorrow.