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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What is the main reason we understand how stars and galaxies form?
We can see all stars forming in real time.
We have detailed records of all stars and galaxies.
We can observe many different versions of similar events happening in the universe.
What was the state of the universe before stars had formed?
It was just spread-out gas and dark matter.
It was completely empty.
It was filled with planets and moons
What causes clumps of dark matter to attract gas?
electromagnetism
gravity
fusion
We don't have a good definition of when to stop calling something "a cluster of stars" and start calling something "a galaxy."
True
False
The Hubble Space Telescope acts as a time machine because it allows us to see objects as they were when the light left them. What does this mean for our understanding of galaxies?
We see them as they are today.
We cannot see galaxies at all.
We see them as they were millions or billions of years ago.
How many galaxies are there in the universe?
Millions
Billions
Hundreds of billions
What has Hubble's observations revealed about the universe over billions of years?
The universe is static and unchanged.
Galaxies are all the same.
The universe is teeming with galaxies that change over time.
What did Hubble discover in the "empty" areas of the sky?
Thousands of galaxies
Hundreds of black holes
Empty space
What is the most common type of galaxy?
spiral
elliptical
irregular
Which component of a spiral galaxy is at its center?
bulge
disc
halo
The stars in the disc are typically much younger than the ones in the halo and bulge.
True
False
Which type of galaxy is characterized by its oval shape and lack of central bulge?
elliptical
irregular
spiral
What are elliptical galaxies typically composed of?
older stars
supernovas
younger stars
What type of galaxy lacks a unqiue shape?
irregular
spiral
elliptical
What phenomenon can cause irregular galaxies to lose their distinct shapes?
Star formation
Supernova explosions
Black hole mergers
What is the estimated age of the Milky Way galaxy?
4 billion years
9 billion years
13 billion
What is significant about the habitable zone?
It is where planets are too hot for life.
It is where planets can potentially support life.
It is where no planets exist.
How long does it take for our solar system to complete one orbit around the center of the Milky Way?
100 million years
250 million years
500 million years
What type of galaxy is the Milky Way?
barred spiral
irregular
elliptical
What is galactic cannibalism?
The collision of two black holes
The process by which stars are formed
The process where larger galaxies absorb smaller ones
What object is found in the center of the Milky Way?
neutron star
supernova
black hole
What is the closest major galaxy to the Milky Way?
Andromeda
Ursa Minor
Canis Major
When will the Milky Way and Andromeda galaxies merge?
4 billion years
6 billion years
2 billion years
What objects in the center of the Milky Way and Andromeda galaxies produces enough gravitational force to mesh them together?
supernovas
pulsar stars
supermassive black holes
What type of galaxy would the Milky Way and Andromeda galaxies become once they collided?
Irregular
Elliptical
Barred
What might happen to the stars during the collision?
Most stars will collide with each other
Stars will be scattered into different orbits
All stars will merge into one
When the 2 galaxies actually collide, what will have happened to the Earth by then?