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Topic 3:Astron. A

Earth in the Universe; pgs (38 - 41)

QuestionAnswer
Can you describe a "Celestial Object"? Anything outside or above Earth's atmosphere.
Define Universe. Everything that exists in any place.
How old is our Universe estimated to be? 13.8, or almost 14 Billion Years Old!
Please explain the Big Bang Theory. Birth of the Universe from a point of singularity. It is expanding like an inflating balloon.
What is the most abundant element in the Universe, and simplest form of matter? Hydrogen, the primary stuff of stars.
What evidence found in space supports the "Big Bang" Birth of our Universe? Background radiation in space in the form of microwaves.
Can you discuss Doppler effect? The shifting of wave lengths of an element's spectral lines over time.
What does red shifting suggest about the distance between Earth and a celestial object? That the two objects are moving apart. Thus, longer wave length, "red run away".
What does blue shifting suggest about the distance between Earth and a celestial object? That the two objects are approaching one another. Thus, shorter wave length, "blue coming at you".
What does the fact that almost all galaxies are red shifting indicate? It suggests that the Universe is expanding in all directions.
Can you compare the rate of expansion of celestial objects closer to our galaxy, when compared with the galaxies further away from the Milky Way? Spectral analysis suggests that galaxies further away are receding faster than those near by! This suggests that the rate of expansion of the universe is increasing.
How is the Hubble Telescope different from others found on Earth? The Hubble Telescope is a satellite orbiting Earth. Thus, it does not have to contend with Earth's atmosphere & issues such as clouds or pollution.
Can you describe a Galaxy? An organized collection of billions of stars. The Milky Way has more than 300 Billion stars.
What is the shape of the Milky Way Galaxy? Spiral galaxy; 100 thousand light years in diameter, and clumped at the center like a fried egg!
Can you define a light year? The distance that light travels in a year. It is a standard unit of length in space. ( about 6 trillion miles )
Where is our solar system located in the Milky Way Galaxy? About 2/3 of the way out from the center,
How would you describe a star? A large, self luminous celestial object primarily composed of hydrogen & helium.
What page of the ESRT would you seek to describe a star? Page 15, top; Star Classification Chart.
By which process do stars shine? Nuclear Fusion. Two Hydrogen combine to form one Helium, plus energy.
Created by: whearn
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