- Light from distant source in observable universe reaches us in 13.75 billion light years; could redshift be caused by
- Can black holes be used to prevent the heat death of the universe?
- If it’s true according to theoretical physics (Dirac equation etc.) that there should be equal amounts of matter and
- What shape is the Universe?
- Why did the universe have such low entropy in the past, resulting in the distinction between past and future and the