The conversation between human and AI assistant.
Is there space between universe?
What is dark matter, and how does it affect the universe?
Dark matter is a type of matter that doesn't interact with light or other forms of electromagnetic radiation, so it's invisible to telescopes. We know it exists because we can see its gravitational effects on visible objects in the universe. It makes up about 23% of the total matter in the universe, and its gravity helps hold galaxies together.