Doppler Affect
What do we call it when sound changes because something is moving?
Doppler Effect
What does “redshift” mean in space science?
Light from something is stretched out and looks more red
What does blueshift mean?
Light is squished and looks more blue ✅
What does it mean when scientists say the universe is expanding?
Space is getting bigger
What is the universe?
Everything in space, including stars, planets, and galaxies
When something making sound moves toward you, what happens to the pitch
It gets higher
What does redshift tell scientists about a galaxy?
It’s moving away from us
What does blueshift tell scientists about a galaxy?
It’s moving closer to us
What is the name of the event that started the expansion of the universe?
The Big Bang
What is the name of the galaxy we live in?
Milky Way
What kind of wave, besides sound, also shows the Doppler Effect and helps scientists study space?
Electromagnetic Waves
Which tool do scientists use to see redshift?
Telescope
What tool do scientists use to study blueshift?
Telescope
What do scientists use to study how the universe is expanding?
Telescopes
What do stars mostly give off?
Light and heat
You hear the Doppler Effect when this vehicle drives by with a loud siren.
Ambulance
What kind of waves are stretched during redshift?
Light waves
What kind of waves are squished during blueshift?
Light waves
What kind of shift in light helps scientists know the universe is expanding?
Redshift
What is a galaxy?
A huge group of stars, dust, and gas held together by gravity
When scientists see a redshift in space, what does it mean the star or planet is doing?
Moving away
Why is redshift important to scientists?
It helps them learn how the universe is expanding
Why is blueshift important to scientists?
It helps them learn which objects are moving toward Earth
Why is the expansion of the universe important to know?
It helps scientists understand how the universe began and changes over time
What do scientists believe is causing the universe to expand?
Dark energy