Question

The electromagnetic spectrum depicts the range of all possible frequencies of electromagnetic radiation. ​
The Electromagnetic Spectrum

The electromagnetic spectrum describes all of the kinds of light, including those the human eye cannot see. In fact, the majority of "light" in the Universe is invisible to our eyes.​ The light we can see, made up of the individual colors of the rainbow, represents only a very small portion of the electromagnetic spectrum. ​
What do scientists use the EM spectrum for? 

Answer 1

Scientists use the electromagnetic spectrum to study a variety of phenomena, including the structure of the universe, the composition of stars and planets, and the behavior of particles. It is also used to detect and study distant objects in space, such as galaxies and black holes. Additionally, the electromagnetic spectrum is used in a variety of applications, such as medical imaging, communications, and remote sensing.