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Earth and Space

Unit 1

QuestionAnswer
what are the three main technologies scientists use to observe objects in space? ground-based telescopes, spacecraft, and satellites
what is one advantage of ground-based telescopes? easily reachable and cheaper
what is one disadvantage of ground-based telescopes? atmosphere blocks some of the views and we can't interact with the object
Why are telescopes placed in space? to get a better view of space
why do scientists need larger telescopes to observe distant objects? they need to gather more sunlight
what is electromagnetic radiation? energy that travels through space
List at least 3 types of electromagnetic radiation gamma ray, radio wave, and x-ray
How are wavelength and energy related? longer wavelength= lower energy shorter wavelength = higher energy they are opposites
how are frequency and energy related? high frequency = high energy low frequency = low energy
why is ultraviolet radiation difficult to observe from Earth? earth's atmosphere reflects it
What is a light-year? distance that light has traveled in a year
Why do scientists use light-years instead of milells of kilometers? because the objects are so far out in space
what is a spectrum? light that passes through space, measured by wavelengths
what does a continuous spectrum look like? rainbow colors, smooth, and no spaces
what does a emission spectrum look like? rainbow colors, light lines
what does an absorption spectrum look like? rainbow colors, dark lines
what can scientists learn from studying spectra? Identify the density and motion of distant objects
What is the Doppler Effect? frequency of sound in motion
what happens to light when an object moves toward Earth? blueshift
what happens to light when an object moves away from Earth? redshift
Created by: user-1998593
 

 



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