Astronomers believe that background radiation is left over noise from the big bang. This noise can be collected and studied using a RADIO telescope.

my answer: radio

The question is a fill in the blank and I filled it in with radio...there is just a line in the question between a and telescope.

ok. I agree.

Thank you

What's the question?

Correct! Radio telescopes are used to collect and study background radiation left over from the big bang.

To understand why radio telescopes are used for this purpose, let's break it down further:

1. Background Radiation: Scientists believe that the Big Bang, which is the prevailing theory about the origin of the universe, generated a burst of energy and matter. As the universe expanded and cooled down, this initial burst resulted in a residual radiation that permeates the entire universe. This is known as cosmic microwave background radiation (CMB).

2. Noise from the Big Bang: The CMB is essentially a low-level, uniform radiation that can be observed as a "noise" in the electromagnetic spectrum. It is a faint signal present across a wide range of frequencies, including radio frequencies.

3. Radio Telescopes: A radio telescope is a specialized instrument designed to receive and detect radio waves emitted by objects in space. Its main function is to capture and amplify electromagnetic radiation at radio frequencies.

By using a radio telescope, astronomers can effectively collect and study the background radiation originating from the Big Bang. These telescopes have the necessary sensitivity and capabilities to detect the faint signals associated with the cosmic microwave background radiation.