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Astronomy
Name_____________________________
Chapter 1
Period____________________________
Review
Date______________________________
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Introduction to Modern Astronomy
Review Questions: (Give answers in your own words)
A Sense of the Universe
1. What was the universe like for ancient/medieval astronomers?
2. How did Astronomy relate to religious beliefs?
3. Why has the understandings and discoveries in the field of Astronomy increased so much over the last
30 years?
Our Modern Perspective of the Universe
4. Since the Copernican revolution (about 400 years ago), we have discovered that the Universe is
immense. For example:
How many Earths could you fit in the Sun?
How many stars are there in our galaxy, the Milky Way?
About how many galaxies can Astronomers see?
6. It has been realized that in the last 50 years that the Universe is __________. We have also discovered
that the Universe contains truly amazing objects like __________ , __________ , __________ ,
__________ , and exploding and colliding __________ .
A Sense of Scale
7. From the Powers of 10 video, about how many powers of 10 would we have to zoom out from this
classroom to see:
the Solar System?
the nearest star(s) next to ours?
the Milky Way Galaxy?
8. How old is the Universe thought to be?
9. How old is our Solar System thought to be?
A Sense of Time
10. If we were to compress time since the Big Bang into one year, and make the time of the Big Bang
January 1, on what date (and hour if appropriate) did:
the Earth form?
all human prehistory begin and last through?
Units and Conversions
11. Show how you would convert 2.34 km to feet.
Scientific Notation and Significant Digits
12. Why do we use scientific notation?
13. Write 3040 in scientific notation with the correct number of significant digits.
14. Write 4.56 x 102 in normal notation with the correct number of significant digits.
15. Complete the following. Give your answer in scientific notation with the correct number of significant
digits.
a. (6.7 x 109) + (4.2 x 109)
b. (4.0 x 108) - (3.0 x 106)
c. (7.0 x 102) * (5.0 x 10-3)
d. (8 x 108) / (4 x 106)
16. Estimate 5,795 x 326 using scientific notation. Show your work.
Give the exact answer using a calculator.
Basic Trigonometry
17. If a certain right triangle has one angle measuring 30.0 degrees, and the length of the side adjacent to
that angle is 10.0 km, identify the length of the hypotenuse and the height of the side opposite that
angle. Draw in this triangle below with labels and show your work.
Basic Algebra
18. During the Voyager explorations of Saturn, we had a graphic demonstration of the finite speed of light.
Saturn is about 10.0 A.U. from Earth (1 A.U. = 1.50 x 108 km). How long after the radio signals left
Voyager near Saturn did we receive them on Earth? Express your answer in hours in normal notation.
Hint: Radio signals travel at the speed of light: 3.00 x 105 km/s. There are exactly 3600 seconds in 1 hour.