Mass Measurements
Doppler Effect
Dark Matter
Rotation Curves
Galaxies and Galaxy Collisions
100
To measure the distribution of mass in a spiral galaxy, we use this.
What is a Galaxy Rotation Curve?
100
Objects moving toward us are shifted in this way.
What is a blue shift?
100
Because of dark matter, the rotation curve of a galaxy looks like this.
What is flat?
100
These two properties are displayed on Rotation Curve graphs.
What are velocity and distance?
100
Active Galaxies have ___ luminosity than Normal Galaxies.
What is higher?
200
We can measure the mass of a celestial body using these two things.
What are Orbital Speed and Orbital Distance?
200
Objects moving away from us are shifted in this way.
What is a red shift?
200
Dark matter is mostly found in this part of galaxies.
What is the halos (or outer disk)?
200
The rotation curve of a galaxy is different than what we expect because of this.
What is dark matter in the halos (or outer disk).
200
Galaxies today are ____ than they were in the past.
What is bigger?
300
Most of the mass in our galaxy is in this form.
What is Dark Matter?
300
Red light is different than blue light because of this.
What is a longer wavelength?
300
Although we don’t know for certain, we think dark matter is made of this.
What are subatomic particles (or NOT normal matter)?
300
Unlike the rotation curve of this, a galaxy's rotation curve is flat.
What is a solar system?
300
Star formation does this during a galaxy collision.
What is increases?
400
The phenomena of light being bent by gravity is called this.
What is Gravitational Lensing?
400
These galaxies have largest redshifts.
What are far away galaxies?
400
We are confident dark matter is not made of these three things.
What are stars, gas, and dust?
400
Orbital speeds mostly depend on this property.
What is the mass within their orbit?
400
This percent of galaxies are colliding at any given moment.
What is 5%?
500
Each point in a rotation curve measures this.
What is the mass inside the star's orbit?
500
We observe doppler shifts in galaxies for these three reasons.
What are rotation, galactic motion in a cluster, and Hubble's Law?
500
This is why dark matter cannot be made of ordinary matter.
What is the visibility of ordinary matter?
500
Rotation curves can only be used for this type of galaxy.
What is a spiral galaxy?
500
This type of galaxy was the predecessor of quasars.
What are small irregular galaxies?
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