Astronomy 1400 Review for Test 1

Astronomy 1400 Review for Test 1 - Astronomy 1400 Review...

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Please make sure you carefully read each chapter study the “ summary of key concepts ” at the end of each chapter. Know the material we have covered in class . The following is a review of the material discussed in class. . All questions can be answered in a few words or sentences. All of these questions were answered in class or are in the text. If you need help with a particular question I will be happy to help provided you first make a significant EFFORT to answer the question on your own. Please bring an orange scantron and #2 pencil to the test: it will be 50 questions multiple choice. You will not need a calculator. All of this material may not be covered on Test 1: the extent of coverage will be announced in class. The remainder will be on Test 2. Chapter 1 1. What is our comic address in order of increasing size? Earth is the third planet from the Sun. Where is the Sun in the Milky Way? 2. How many galaxies are in our local group? Are all the galaxies in our local group travelling away from each other? 40. Some of them move towards us, some of them move away from us, and at least two small galaxies orbit the Milky Way Galaxy. 3. About how many stars are in our galaxy? More than 100 billion. 4. How are heavier elements (than is, elements heavier than Lithium) produced? In what sense are we then made of “star stuff”? Following this line of thought, why do scientists think the Universe was lifeless for at least about 2 billion years? 5. What do we mean by the “observable Universe”? Can we see the actual edge of our universe and consequently know exactly how big it is? The portion of the entire universe that can be seen from Earth, at least in principle. The observable universe is probably only a tiny portion of the entire universe. 6. About how old is the universe? 14 billion years old. 7. Define galaxy, and solar system. Galaxy: a great island of stars in space, containing from a few hundred million to a trillion or more stars. Solar System: consists of the sun and all the objects that orbit it; the planets and their moons, and countless smaller objects including rocky asteroids and icy comets. 8. If we scale the history of the universe into one year, when did the Milky Way form? The Milky Way formed in early February. Earth? Earth forms September 3. When did the dinosaurs become extinct? Dinosaurs became extinct December 30 th . When did human civilization occur? December 30 th at 11:58 P.M. 9. Define light year, astronomical unit, and parsec. Which is largest? Smallest? Light-year: The distance that light can travel in one year, which is about 9.46 trillion kilometers. Astronomical Unit: The average distance between the Earth and the Sun, which is about 150 million kilometers. Parsec: Approximately equal to 3.25 light years; it is the distance to an object with a parallax angle of 1 arcsecond. Parsec is the largest. AU is the smallest.
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Astronomy 1400 Review for Test 1 - Astronomy 1400 Review...

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