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

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?

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

Radio Telescope

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

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

European Infrared Telescope HESS Gamma-ray Telescope *Africa

Chandra X-ray Observatory International Ultraviolet Explorer

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)

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

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