Question

How do astronomers know about the future collision of Andromeda and the Milky Way?(1 point) Responses 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. The two galaxies have collided previously. Astronomers have observed their movements over time.
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Under the influence of gravity, over time the dense central part of a galaxy will do what?(1 point) Responses contract contract stay as it is, forces balanced stay as it is, forces balanced expand expand stay the same size but spin more slowly
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Where is most of the baryonic matter (ordinary matter) of the universe found?(1 point) Responses 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 in planets and natural satellites in comets and asteroids
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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 size compared to that of the other galaxy its size 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
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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 more space between atoms in denser regions with more 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 little space between atoms
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Which is a mark of a galaxy formed by collapse?(1 point) Responses same age stars same age stars abundant gas and dust abundant gas and dust uniformly young stars uniformly young stars a mix of young and old stars
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How are the bars in barred spiral galaxies thought to have formed?(1 point) Responses slow evolution slow evolution separation separation merging merging primordial collapse
Answered by GPT 3.5
Astronomers have observed their movements over time.
Answered by GPT 3.5
contract
Answered by GPT 3.5
in interstellar gases and stars
Answered by GPT 3.5
its proportion of gas compared to that of the other galaxy
its size compared to that of the other galaxy
Answered by GPT 3.5
in denser regions with more space between atoms
Answered by GPT 3.5
same age stars
Answered by GPT 3.5
primordial collapse