PHYS 1306 - Exam 3 Review

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What is the Big Bang theory?

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The Big Bang theory is the leading explanation for the origin of the universe, proposing that it began as a singularity approximately 13.8 billion years ago and has been expanding ever since.

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What does AGN stand for and what is its significance in astronomy?

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AGN stands for Active Galactic Nuclei, which are regions at the center of some galaxies that are extremely bright and energetic, often due to the presence of supermassive black holes accreting matter.

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What is a reflection nebula and what color is it typically associated with?

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A reflection nebula is a cloud of dust and gas that reflects the light of nearby stars. It is typically associated with the color blue due to the scattering of light from hot young stars.

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What is the Cosmic Microwave Background (CMB) and when was its light released?

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The Cosmic Microwave Background is the afterglow radiation from the Big Bang, released approximately 400,000 years after the event when the universe cooled enough for protons and electrons to combine into hydrogen atoms.

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What type of collisions are responsible for the formation of spiral galaxies?

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High angular momentum collisions are responsible for the formation of spiral galaxies, as they allow for the conservation of angular momentum and the development of spiral structures.

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What is the significance of the Cosmic Microwave Background in cosmology?

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The Cosmic Microwave Background provides critical evidence for the Big Bang theory and helps cosmologists understand the early universe's conditions and the subsequent formation of large-scale structures.

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What are the main components of an Active Galactic Nucleus?

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The main components of an Active Galactic Nucleus include a supermassive black hole, an accretion disk of gas and dust, and often jets of particles that are ejected at high speeds.

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How does the color of a reflection nebula differ from that of an emission nebula?

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A reflection nebula appears blue due to the scattering of light, while an emission nebula emits light of various colors due to ionized gases, often appearing red due to hydrogen emission.

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What role do supernovae play in the formation of new stars?

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Supernovae can trigger the collapse of nearby gas clouds, leading to the formation of new stars by compressing the material and initiating nuclear fusion.

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What is the relationship between galaxy collisions and galaxy evolution?

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Galaxy collisions can lead to significant changes in galaxy structure, triggering star formation, merging galaxies, and influencing the overall evolution of galaxies.