unit 5 lesson 1 images from space copyright © houghton mifflin harcourt publishing company

Unit 5 Lesson 1 Images from Space

Copyright © Houghton Mifflin Harcourt Publishing Company


Florida Benchmarks


• SC.8.N.4.2 Explain how political, social, and economic concerns can affect science, and vice versa.

• SC.8.E.5.10 Assess how technology is essential to science for such purposes as access to outer space and other remote locations, sample collection, measurement, data collection and storage, computation, and communication of information.


Florida Benchmarks


• SC.8.E.5.11 Identify and compare characteristics of the electromagnetic spectrum such as wavelength, frequency, use, and hazards and recognize its application to an understanding of planetary images and satellite photographs.

On the Same Wavelength?


What is electromagnetic radiation?

• Energy traveling as electromagnetic waves is called electromagnetic radiation.

Wavelength is the distance between two adjacent crests or troughs of a wave.

• Frequency is the number of waves per second.


How is electromagnetic radiation classified? Radio waves are the longest-wavelengths.

• Microwaves have shorter wavelengths and higher frequencies than radio waves.

• Infrared waves are next and are sometimes called “heat radiation.”



How is electromagnetic radiation classified?• Visible light has a shorter wavelength than

infrared.

Visible light allows you to see ex) red light, blue light, violet light, etc

• Ultraviolet radiation, X-rays, and gamma rays have increasingly shorter wavelengths.



How is electromagnetic radiation classified? All wavelengths or frequencies make up the

electromagnetic spectrum.

A spectrum is a continuous range of a single feature, in this case wavelength.



The Better to See You With


What are some characteristics of electromagnetic radiation?• Different types of electromagnetic waves interact

with matter differently.

• Objects can give off heat, light, and other forms of electromagnetic energy.

• For example, physicians use X-rays to examine the inside of the body.


What are some characteristics of electromagnetic radiation? In small amounts, electromagnetic radiation can

be very useful.

• Large amounts of any type of radiation can cause problems because of the total amount of energy carried.



What electromagnetic radiation reaches Earth?• In the atmosphere, atoms and molecules reflect or

absorb some of the incoming radiation.

• Most visible light and radio radiation reach Earth’s surface.

• Some ultraviolet radiation reaches Earth. X-rays and gamma rays never reach Earth’s surface.




• Images of objects in space tell us about their positions and properties.

• Telescopes can collect all forms of electromagnetic radiation from space.

• Special detectors in telescopes must be used to form images from radiation other than visible light.

Infrared telescopes collect wavelengths that are longer than ultraviolet light.

Different types of telescopes are needed to collect data from different ranges of radiation.


What can you learn about Earth from satellite images?• Remote-sensing images can show human

activities, how things change over time, and lights from populated areas.

• Remote-sensing images can also show population changes, forests, forest fires, weather patterns, and storms.



Seeing Is Believing


What can you learn from space images?• Different types of radiation can reveal more

features of an object than visible light alone.

• Other forms of radiation can see through dust in space.

• Some images from space are the result of multiple images put together from multiple wavelengths of light.


unit 5 lesson 1 images from space copyright © houghton mifflin harcourt publishing company

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