admin Administrator Staff member Nov 11, 2019 12,346 453 0 Visit site Nov 5, 2022 #1 The universe is about 13.8 billion years old, but how do we know that? How do we know the age of the universe? : Read more
The universe is about 13.8 billion years old, but how do we know that? How do we know the age of the universe? : Read more