Question

To astronomers accidentally discovered the blank which is evidence of universe expansion that supports the Big bang theory this is practical practically strong evidence because it s temperature is blank by observing this today we can see what the universe look like blank

Answer 1

To astronomers, the **cosmic microwave background radiation (CMB)** is evidence of the universe's expansion that supports the Big Bang theory. This is practically strong evidence because its temperature is **approximately 2.7 Kelvin**. By observing this today, we can see what the universe looked like **about 380,000 years after the Big Bang**, when the universe had cooled enough for atoms to form, allowing light to travel freely through space.