Question

which evidence supports the idea that cosmic microwave background radiation is a remnant of the big bang?
a. its temperature is uniform
b. its mass is uniform
c. its mass fluctuates greatly
d. its temperature fluctuates greatly

Answer 1

The evidence that supports the idea that cosmic microwave background radiation (CMBR) is a remnant of the Big Bang includes:

**a. its temperature is uniform**

The uniformity of the CMBR temperature across the sky supports the Big Bang theory because it suggests that the early universe was in a hot, dense state that expanded and cooled uniformly. Thus, option **a** is the correct choice.

In contrast, options b, c, and d do not accurately describe the CMBR in relation to the Big Bang.