What is the universe?
How old is the universe?
How big is the universe?
What is the Big Bang theory?
What is dark matter?
What is dark energy?
What are galaxies?
What is a black hole?
How many stars are there in the universe?
What is the multiverse theory?
What is the fate of the universe?
What is a supernova?
What is the cosmic microwave background (CMB) radiation?
What is a light-year?
