Scientist Galileo Galilei used the to observe the stars and planets. This same tool has allowed modern to see objects that are billions of light years from Earth. This tool also detects things such as and x-rays, which are invisible to the human eye?

The telescope is an optical instrument that allows you to observe distant objects, such as the planets of our solar system, to stars thousands of millions of light years away, in much more detail than the naked eye, by capturing the entire spectrum of electromagnetic radiation, like x-rays or light.