Question 1:

What is the cosmic microwave background radiation?

Explanation: The cosmic microwave background radiation is radiation leftover from the early universe, which has cooled down and stretched to microwave wavelengths.

Question 2:

Who discovered the cosmic microwave background radiation?

Explanation: Arno Penzias and Robert Wilson discovered the cosmic microwave background radiation in 1965.

Question 3:

What is the approximate temperature of the cosmic microwave background radiation today?

Explanation: The approximate temperature of the cosmic microwave background radiation today is 2.7 Kelvin.

Question 4:

What does the cosmic microwave background radiation provide evidence for?

Explanation: The cosmic microwave background radiation provides evidence for the inflationary expansion of the early universe, supporting the theory of cosmic inflation.

Question 5:

What does the uniformity of the cosmic microwave background radiation across the sky indicate?

Explanation: The uniformity of the cosmic microwave background radiation across the sky indicates the isotropy (homogeneity) of the early universe, supporting the idea of a smooth and evenly distributed universe at early times.