IOAA 2nd problems: universe expansion

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Thread starter Petch Phumrapee
Start date Aug 3, 2017
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Astronomy Astrophysics Cosmolgy Expansion Universe Universe expanding

In summary, the second set of problems for the International Olympiad on Astronomy and Astrophysics (IOAA) focuses on the concept of universe expansion. This includes topics such as the Big Bang theory, the expansion of the universe, and the role of dark energy in this process. Students will be required to demonstrate their understanding of these concepts through various problem-solving tasks, showcasing their knowledge of astrophysics and cosmology.

Aug 3, 2017

Petch Phumrapee

Could anyone please guide me how to do these problems?

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Aug 3, 2017

PeterDonis

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Petch Phumrapee said:

Could anyone please guide me how to do these problems?

Please post each problem individually in the homework forum, using the homework template. That will require you to make some effort to solve them yourself.

1. What is the evidence for the expansion of the universe?

The evidence for the expansion of the universe comes from various observations and experiments, including the redshift of distant galaxies, the cosmic microwave background radiation, and the Hubble's law. These all indicate that the universe is expanding and that galaxies are moving away from each other.

2. How does the universe expansion affect the movement of objects in space?

The universe expansion does not directly affect the movement of objects in space. It is the result of the expansion that causes galaxies to move away from each other. However, the expansion does play a role in the eventual fate of the universe and the movement of objects within it.

3. Has the rate of universe expansion changed over time?

Yes, the rate of universe expansion has changed over time. In the past, the expansion was slower and has been gradually accelerating due to the mysterious force called dark energy. This acceleration is causing the expansion to become faster and faster as time goes on.

4. What is the role of dark energy in universe expansion?

Dark energy is thought to be the driving force behind the accelerating expansion of the universe. It is a mysterious form of energy that permeates all of space and has a repulsive effect, pushing galaxies away from each other. However, its exact nature is still not fully understood.

5. Will the universe continue to expand forever?

Based on current observations and theories, it is believed that the universe will continue to expand forever. However, the rate of expansion may change over time and it is also possible that the expansion may eventually slow down or even reverse in the distant future. This is still an area of active research and not fully understood.