Whatchamacallit
disk like galaxies with arms
light year
The Milky Way is this type of galaxy
The effect where light waves are shifted by light moving either towards or away from an observer.
What is the Doppler Effect
Besides stars, galaxies are also made up of lots of this.
galaxies with arms and an elongated central region
Time it takes for a photon to travel from the Sun to Earth
8 minutes
What exists at the center of almost all major galaxies including the Milky Way?
As light moves away from an observer, the observable spectrum is what color?
What is red (Red-shift)
The milky way in our night sky appears like a spiral or a band of light across the sky?
What is a band of light
do not have a distinct shape or symmetry and do not fit into other categories
irregular
Time it takes for light to travel to the outermost planet in our solar system
5.5 hours
What type of stars are located at the center of the Milky Way
Mostly K and M (Orange-Red)
The hubble constant is due to a relationship between what two factors?
What are distance and velocity
Dark Energy is a force that is causing the universe to __________________.
What is expand.
galaxies that are not flat, do not have arms and are red in color
elliptical
100,000 light years
In general, the Milky way has mostly these types of stars
What are O-type stars (blue & white!)
Most galaxies are moving what direction relative to the Milky Way
What is away from the Milky Way.
Besides the Milky Way, what other galaxies are part of the local group?
What are Andromeda, Triangularium and the LMC.
What is the center of a spiral galaxy called?
bulge or nucleus
The distance from the Solar System to the center of the Milky Way (in light years)
about 25,000-27,000 light years
To find the center of the Milky Way in our night sky, what constellation should one look at?
What is Sagitarrius
Hubble found that as distance between galaxies increase, their speed _______________.
What is increases.