The Tools of Astronomers

1. universe: everything that exist.
2. telescope: a device that collects light and makes distan objects appear closer and lager.
3. refraction: the bending of wave as they go from one substace to another.
4. reflection: the boucing of waves off a surface.
5. wavelength: the distance from one peak to the next on a wave.
6. frequency: the number of waves that pass through a point in a second.
7. electromagnetic spectrum: waves of light in order be wavelength.