1. Tools of Astronomy

2. Radiation Light is the common term for electromagnetic radiation
The human eye can only see a limited range of all the various wavelengths of electromagnetic radiation
Electromagnetic radiation includes not only visible light, but also infrared and ultraviolet radiation, radio waves, microwaves, X rays, and gamma rays

3. Telescopes
Objects in space emit radiation in all portions of all the electromagnetic spectrum
A benefit is that detectors can be attached that see wavelengths the human eye cannot see
It also brings more light to focus than the human eye
A third benefit is it allows astronomers to used specialized equipment

4. Refracting and Reflecting Telescopes
Refracting telescopes were invented around the year 1600
In 1668 the reflecting telescope was invented and uses mirrors
Both are used today, but most of these are reflecting telescopes

7. Radio Telescope

8. Interferometry

9. Spiral Galaxy
New Planet Forming
Stellar Nursery
New Star