Space is not empty, it is full of energy. The universe is dynamic. The energy flows and some scientists argue that 'the universe is dancing'.
‘At the quantum level reality doesn’t exist if you are not looking at it’ Andrew Truscott physicist.
When stars die they become black holes, dark places where no light can escape. We have not yet found out how a black hole is on the inside, just like dark matter and dark energy which scientists have theorized form the building blocks of most of the universe remain a mystery as well. In short, despite incredible advances in science and technology we still do not know most of the universe, how it is constructed, what kind of matter and energy it contains, nor do we know what will become of this matter. We do not know how things began and how things will end, we are in darkness and obscurity.