Week 1 Sci 151 Essay

1268 Words Sep 2nd, 2013 6 Pages
Complete the outline following the instructions above. Use the example as a guide, using complete sentences for all subpoints.

1. Our place in the universe
a. The modern view of the universe
1) What is our Sun and what is its role in the solar system?
a. The Sun is a fairly ordinary but large star.
b. The Sun is the focal point of our solar system, because all of the planets orbit the Sun.
2) What is our Milky Way galaxy and the sun’s position in it?
a. The Milky Way galaxy is where our solar system is located in the universe.
b. The Milky Way galaxy is home to over 100 billion stars and the Sun is one of those stars.
3) What is the Big Bang and what does it say about the age of the universe?
a. The Big Bang is when the
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Compare that to fast things in day-to-day life.
a. The Earth revolves around the Sun about 60,000 miles per hours.
b. This could be similar to driving a race car as fast as possible around an oval type track.
2) How is our Sun moving in the galaxy? a.)The Sun is moving by orbiting the center of the galaxy. b.) The Sun makes this revolution every 230 million years
3) How are the galaxies around the Milky Way galaxy moving from our point of view?
a. The galaxies around the Milky Way galaxy are moving farther away.
b. The farther away a galaxy is the faster it appears to be moving away.
c. Space is constantly expanding and this somewhat pushes galaxies farther away.
2. The sky and the science of astronomy
a. Explain the significance of the celestial sphere.
1) What important directions and coordinate systems help you find your way around the sky?
2) Why are there different brightness of stars and how do we describe their brightness as compared to one another?
a. Stars may appear brighter because they are burning hotter than other stars around them.
b. Some stars may appear brighter because they are larger than other stars.
3) What are constellations?
a. Constellations are defined regions within the sky.
b. Patterns in stars help locate these regions.
4) What is Polaris and what is its significance in the sky?
a. Polaris is commonly known as the North Star.
b. Polaris is the closest

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