Which is a mark of a galaxy formed by collapse?(1 point)
Responses
a mix of young and old stars
a mix of young and old stars
same age stars
same age stars
uniformly young stars
uniformly young stars
abundant gas and dust
abundant gas and dust
Which factors are most likely to affect whether a galaxy will evolve by merging with a second galaxy? Select the two correct answers.(1 point)
Responses
its proportion of gas compared to that of the other galaxy
its proportion of gas compared to that of the other galaxy
its age compared to that of the other galaxy
its age compared to that of the other galaxy
its distance from the other galaxy
its distance from the other galaxy
its size compared to that of the other galaxy
its proportion of gas compared to that of the other galaxy
its size compared to that of the other galaxy
When parts of a gas cloud collapse, where does the material first form clumps?(1 point)
Responses
in less dense regions with little space between atoms
in less dense regions with little space between atoms
in denser regions with little space between atoms
in denser regions with little space between atoms
in less dense regions with more space between atoms
in less dense regions with more space between atoms
in denser regions with more space between atoms
How are the bars in barred spiral galaxies thought to have formed?(1 point)
Responses
slow evolution
slow evolution
separation
separation
primordial collapse
primordial collapse
merging
Where is most of the baryonic matter (ordinary matter) of the universe found?(1 point)
Responses
in comets and asteroids
in comets and asteroids
in dark matter and dark energy
in dark matter and dark energy
in interstellar gases and stars
in interstellar gases and stars
in planets and natural satellites
How do astronomers know about the future collision of Andromeda and the Milky Way?(1 point)
Responses
Astronomers have observed their movements over time.
Astronomers have observed their movements over time.
All galaxies will collide at some point.
All galaxies will collide at some point.
The Milky Way has changed course to head toward Andromeda.
The Milky Way has changed course to head toward Andromeda.
The two galaxies have collided previously.
Astronomers have observed their movements over time.
Under the influence of gravity, over time the dense central part of a galaxy will do what?(1 point)
Responses
stay the same size but spin more slowly
stay the same size but spin more slowly
expand
expand
stay as it is, forces balanced
stay as it is, forces balanced
contract