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 planets and natural satellites
in planets and natural satellites
in interstellar gases and stars
in interstellar gases and stars
How are the bars in barred spiral galaxies thought to have formed?(1 point)
Responses
merging
merging
primordial collapse
primordial collapse
slow evolution
slow evolution
separation
merging
Which is a mark of a galaxy formed by collapse?(1 point)
Responses
uniformly young stars
uniformly young stars
same age stars
same age stars
a mix of young and old stars
a mix of young and old stars
abundant gas and dust
uniformly young stars
How do astronomers know about the future collision of Andromeda and the Milky Way?(1 point)
Responses
The Milky Way has changed course to head toward Andromeda.
The Milky Way has changed course to head toward Andromeda.
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 two galaxies have collided previously.
Astronomers have observed their movements over time.
When parts of a gas cloud collapse, where does the material first form clumps?(1 point)
Responses
in less dense regions with more space between atoms
in less dense regions with more space between atoms
in less dense regions with little space between atoms
in less dense regions with little space between atoms
in denser regions with more space between atoms
in denser regions with more space between atoms
in denser regions with little space between atoms
in denser regions with little space between atoms
Under the influence of gravity, over time the dense central part of a galaxy will do what?(1 point)
Responses
stay as it is, forces balanced
stay as it is, forces balanced
expand
expand
contract
contract
stay the same size but spin more slowly
stay the same size but spin more slowly