If astronomers look toward any point in outer space, they see radiation that matches the emission spectrum of an object at 2.7 k, a remnant of the big bang.

That statement is false.

If they want to see radiation that matches emission spectrum of an object at 2.7 k, they need need to look at THE POINT BETWEEN stars and galaxies. So 'any point' is not a correct term on this case. And also, big bang actually is just a theory, they still haven't know for sure what remnant is it