Reflection: Answer as many as you like (at least 1).
What is something new you learned?
What is something that suprised you?
What questions do you have?
What would you like to learn more about?
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Question 24
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Objects in space are being held together by __________.
Objects in space are being pulled apart by __________.
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Question 28
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How many times could the Milky Way (our galaxy) fit into the universe as we know it?
1 million times
10 million times
10 million, million, million times
What is the term used for the part of the universe that we can actually see?
visible universe
infinite universe
observable universe
What is redshift used for in astronomy?
Determining the distance of galaxies
Mapping the cosmic background radiation
Measuring brightness of stars
What is the main component theorized to hold the universe together, which we cannot see?
dark matter
dark energy
black holes
What is happening to the size of the universe?
Shrinking
Staying the same
Expanding
How much of the universe is believed to be made up of dark energy?
50%
68%
75%
What does the flatness of the universe imply?
It could go on forever
It is curved
It is finite in size
What is the widely accepted explanation for the origin of the universe?
Steady State Theory
Big Bang Theory
String Theory
What did the universe begin as according to the Big Bang Theory?
A hot and infinitely dense point
A gigantic supernova
A cold void
What was created with the Big Bang? (select all that apply)
matter
energy
space
time
What was the first chemical element created in the universe?
helium
carbon
hydrogen
What was the second chemical element created in the universe?
carbon
hydrogen
oxygen
What created almost all of the remaining elements in the universe?
stars
supernova
black holes
How do astronomers use redshift to describe?
The distance of objects in space
The speed of sound
The color of stars
When light waves are compressed, what happens?
Frequency increases, appears blue
Remains the same
Frequency decreases, appears red
When light waves are spread out, what happens?
Frequency increases, appears blue
Remains the same
Frequency decreases, appears red
Why is light from distant galaxies redshifted?
Because the universe is expanding
Because light is absorbed by gas
Because it has a shorter wavelength
What is the estimated age of the universe?
12.2 billion years
13.8 billion years
15.5 billion years
What does the term "redshift" refer to in the context of astronomy?
The color of stars
The temperature and brightness of supernovas
The stretching of light waves from moving objects
Why were earlier calculations of the universe's age inaccurate?
They were based on incorrect data
They assumed a constant rate of expansion
They did not account for light speed
What significant discovery was made in 2011 regarding the universe’s expansion?
The universe's expansion is slowing down
The universe is static
The universe's expansion is accelerating
What is the Cosmic Microwave Background (CMB)?
The afterglow of the Big Bang
The light from distant galaxies
The radiation produced by black holes
What does Cosmic Microwave Background (CMB) help astronomers determine?
rate of expansion
brightness of stars
age of universe
Which scenario predicts the universe would continue to expand and become darker and colder?
Big Crunch
Big Freeze
Big Rip
Which scenario predicts the universe would continue to expand until the matter that makes up stars and the rest of the universe breaks up into tiny pieces?
Big Freeze
Big Rip
Big Crunch
Which scenario predicts the universe's expansion would be reversed?
Big Crunch
Big Freeze
Big Rip
What does the theory of the Big Bounce suggest?
The universe could expand and contract repeatedly.
The universe will expand infinitely without any changes.