1. Bell Ringer
Cell phones have become an important device in modern society. Which wavelength of the Electromagnetic Spectrum do you believe is responsible for sending and receiving cellular communications? Talk with your neighbor to come up with an answer. Defend your answer

2. Images from Space (Page 55)
Essential Question:
How do we know all that we know about objects in space that are far from the Earth?

6. All wavelengths do not penetrate Earth’s atmosphere, so…

8. Radio Telescope

9. Aperture Radio Telescope – China
*World’s largest – 500 meters

10. Owens Valley Radio Observatory – California
*250 antennae over an area the size of 450 football fields

11. European Infrared Telescope
HESS Gamma-ray Telescope
*Africa

12. Chandra
X-ray Observatory
International Ultraviolet Explorer

13. What the wavelengths tell us about an object:
Radio waves – Detects areas of gases and dust
Infrared – Temperature parts of objects
Visible light – What it looks like with our eyes
U.V. – Composition of the object
X-rays – Detects higher levels of energy
Gamma rays – Shows highest levels of energy from the object (e.g. - black holes)

14. Essential Question:
How do we know what we know about objects in space that are far from Earth?
Horsehead Nebula

15. Conclusion
Quick Write - How do we know what we know about objects in space that are far
from the Earth?
Horsehead Nebula