1, When and how were radio waves discovered? Why do you think they hadn’t been discovered before?
2. Why are radio telescopes often linked together into arrays?
3. In the last few seconds of the video, a sound is generated as the view scans across the plot. What makes that sound?


4. How do radio waves travel through space?
5. What have we learned about our universe by “seeing” it at radio frequencies?
6.Where is visible light along the EM spectrum?

7. Why is it true to say that all EM radiation is “light” even though we can see only a small slice of the spectrum as visible light?

8. Why is it often useful to compare images taken at visible wavelengths with images taken at other wavelengths? What can scientists learn by comparing what something on Earth or in space looks like at different zones along the EM spectrum?
9. Make a list of all the uses we have for microwave energy.
10. How are microwaves used in weather prediction?