Unit 9: Universe Expansion Flashcards
The position of stars changes in the universe because the universe is constantly…
Expanding
Which 2 elements are stars mainly made of?
Helium and Hydrogen
We can detect the motion of a star by studying its… (Wavelengths of Light or Recording its temperature?)
Wavelengths of light
What is the name of the device that allows us to study the wavelengths of light from stars and galaxies?
Spectroscope
How large was the universe at the very beginning?
Size of an Atom
What happens to the light of the universe as it gets farther away… Does the wavelength longer or shorter?
Longer
When an object in space is getting closer to Earth, it is called…what shift?
Blue shift
The farther away a galaxy is the ____ it is moving.
Faster
Who discovered the theory of redshift?
Edwin Hubble
In an experiment to represent our expanding universe, you blow up 5 balloons and put them on the floor. How would you move the balloons to represent Universe expansion?
By moving them away from each other, showing red shift.
How old is our universe?
13.7 billon years old.
Define the Doppler Effect.
Change in frequency of a wave in relation to an observer who is moving relative to the wave source.
Define Hubble’s law.
The farther away light is, the faster it goes.
What is a real-life example of the Dopler Effect? (ANSWERS WILL VARY)
Hearing an ambulance signal from a car and as it passes you, the louder the sound becomes but when it moves away from you, the sound becomes fainter.
