Pictures and Sentences

1. universe: Earth and all the things in space are part of the universe.

2. telescope: The astronomer more use the telescope to study the space.

3. refraction: Refraction is one of the kinds of telescope.                                                              

4. reflection: Reflaction telescope help tu visualize how light wave travels is to shake a string.

5. wavelength: Wavelength moustly is measured in meters.                                              

6. frequency: Its moustly is measured in sycles per second, or hertz.                        

7. electromagnetic spectrum: Its has a order that is radio, microwave, infrered, visible,

violet, ultraviolet, X-rays, and gamma ray.