Question: Because the original assumption about all matter interacting with electromagnetic radiation was proved incorrect for the Milky Way Galaxy, scientists next need to determine whether the assumption still holds true for other galaxies. To do this, scientists need a way to calculate the masses of individual galaxies and galaxy clusters, so they can compare those masses with the luminous matter we actually observe. Astronomers use rotation curves to measure the masses of individual spiral galaxies. The faster the stars orbit about the center of a galaxy, the more mass there is between them and the galactic center. Starting from the hypothesis that other galaxies are made up only of visible matter, astronomers can predict what the galaxy rotation curves would look like if the hypothesis were correct. Sort the galaxy rotation curves according to whether they would support or refute the hypothesis that galaxies are made up only of visible matter.
a) Rotation Curve 4
b) Rotation Curve 3
c) Rotation Curve 1
d) Rotation Curve 2
e) Rotation Curve 6
f) Rotation Curve 5
Explanation:
Disproves hypothesis:
b) Rotation Curve 3
c) Rotation Curve 1
d) Rotation Curve 2
Supports hypothesis:
a) Rotation Curve 4
e) Rotation Curve 6
f) Rotation Curve 5
If the hypothesis that galaxies are made only of visible matter is correct, then the galaxy rotation curves should show both an increase and a decline in rotational speed. There should be a peak in rotational speed near the region of concentrated starlight in the galaxy's center. There should then be a decline in rotational speed toward the galaxy's edge, where there is a smaller concentration of visible matter. The steady decline in rotational speed should occur because the stars are farther and farther from the galaxy's center. This distance acts to lessen the effect of gravity due to the central mass concentration.
However, actual measurements of galaxy rotation curves show a flattening or steady increase in rotational speeds, even at large distances from the galaxy centers. This result implies that there must be matter within these galaxies that cannot be seen; in other words, dark matter must be present in other galaxies just as it is present in the Milky Way. Therefore, the data scientists collected refutes the hypothesis that galaxies are only composed of visible matter.
The lowest population is Norway.
Answer:
Explanation:
Sustainability could simply be defined as the reasonable maintainance at present to prevent compromising the availability of such resources in the future. Sustainable development has become a popular term in our changing environment today especially as the need for energy as soared and the need to mitigate and adapt to the use of more climate friendly resources has become increasingly important. We need to tailor our needs and wants in such a way that it does not jeopardize the environment the future generations will live in. Changes in climate and weather patterns is on the horizon largely due to continued emission of green house gases (mostly carbon) into the atmosphere, these emissions will most likely increase as the energy demands have risen largely due to population growth. Without sustainable development strategies, the environment runs the risk of being challenged by food security, water level changes all due to changes in climatic condition triggered largely by human activities.
The length of the meandering course of the Souris River is approximately 70 m, while the length of a river flowing in a straight line is approximately 20 m.
<h3>What is a meandering river?</h3>
A meandering river is a river that is characterized by having a course with several turns that make it look like the movement of a snake.
These rivers generally change the shape of their course by the action of sedimentation. However, the serpentine form will always stand out.
<h3>How does the length of a meandering river compare to a river that flows in a straight line?</h3>
As shown in the diagram, the length of a meandering river should be measured by segments between its curves, on the other hand, the river flowing in a straight line can be measured in a unified way or by segments.
Additionally, it can be seen how the meandering river has a greater length in the same distance than the river that flows in a straight line.
Note: This question is incomplete because the map is missing. However I can answer it based on my general prior knowledge.
Learn more about length in: brainly.com/question/8552546
