Who plotted recessional velocities against the distance to galaxies and found a constant that is now used to describe the expansion of the universe?
Who is Hubble?
100
The name of our galaxy
What is the Milky Way
100
Round smooth galaxies are called this
What are elliptical galaxies?
100
The name of the prominant theory describing the formation of the universe.
What is the big bang?
100
We need to know more about this before we can predict the fate of the universe.
What is dark energy?
200
What is the name of our galaxy cluster?
What is the local group?
200
The location of the sun in our galaxy
What is 2/3 of the way out on the Orion Arm.
200
Which kind of galaxy has arms with newer stars and centers with older stars?
What are spiral galaxies?
200
What is the point called from which all space, time, and matter emerged?
What is a cosmic singularity?
200
This is how we know dark energy exists
What is the cause of expansion of the universe
300
How did Hubble determine the velocities to galaxies?
What is with their redshifts?
300
The Milky way is this type of galaxy
What is a spiral galaxy
300
Which kind of galaxy has the least star formation occuring?
What are elliptical galaxies?
300
Name two pieces of evidence that support the big bang theory.
What is
1. recession velocity of galaxies
2. cosmic background radiation
3. relative abundances of elements in the universe
300
If expansion slows and then the universe contracts again there will be a big __________, if it expands again after that there will be a big ___________.
What is crunch and bounce
400
What is at the center of most if not all galaxies?
What are black holes?
400
The reason the arms are white and center is more yellow.
The arms are still forming stars, while the center contains older 2nd generation.
400
How do we know galaxies are moving away from us?
What are their redshifts?
400
What is the time period just after the big bang called?
What is inflationary period.
400
What determines the difference between a big freeze and big rip?
the speed of the galaxies. >c or < c
500
How is an astronomical image created?
What is with three filters from different wavelengths colored based on the wavelength. Red= longest, blue = shortest, green= middle.
500
Who plotted the galaxy with globular clusters? Why did he think it was bigger than we know it now to be?
Who is Harlow Shapely? He didn't account for dust dimming so thought clusters were farther than they are.
500
Once two galaxies merge they form a strange looking thing called