what do scientists know about the future of the universe?\nwhat dark matter is made of\nwhy the expansion of…

what do scientists know about the future of the universe?\nwhat dark matter is made of\nwhy the expansion of the universe is accelerating\nthat stars will eventually burn out causing the universe to become cold and dark\nthat galaxies spin much slower than they should based on visible matter
Answer
Brief Explanations:
Scientists know that stars have a finite - life and will eventually exhaust their fuel and burn out. This will lead to a darkening of the universe as there will be less light - emitting sources. The nature of dark matter, the cause of the universe's accelerating expansion, and the discrepancy in galaxy rotation speeds based on visible matter are still areas of active research and not fully known.
Answer:
that stars will eventually burn out causing the universe to become dark and cold