1. Chapter 6
Exploring Space

2. Energy that can travel through space in the form of waves.
Electromagnetic
Radiation
Energy that can travel through space in the form of waves.

3. Visible Light
The light you can see.

4. The distance between the crest of one wave and the crest of another.
Wavelength
The distance between the crest of one wave and the crest of another.

5. Frequency
The number of waves that pass a given point in a certain amount of time.

6. A range of colors or wavelengths.
Spectrum
A range of colors or wavelengths.

7. Pictures based on computer data that have been taken from satellites.
Satellite photographs
Pictures based on computer data that have been taken from satellites.

8. The tiny dots that make up a satellite image.
Pixels
The tiny dots that make up a satellite image.

9. Planetary Image
A picture of a planet taken in visible light or in another form of electromagnetic radiation.