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© 2011 Pearson Education, Inc.
Chapter 1
Astronomy Today
7th Edition
Chaisson/McMillan
© 2011 Pearson Education, Inc.
Charting the Heavens 1
Reading pg. 3-8
© 2011 Pearson Education, Inc.
• Our place in the Universe
• Constellations
© 2011 Pearson Education, Inc.
© 2011 Pearson Education, Inc.
1.1 Our Place in Space
• Earth is average—we don’t occupy any special place in the universe
• Universe: totality of all space, time, matter, and energy
© 2011 Pearson Education, Inc.
1.1 Our Place in Space
Discuss with a partner, •What is Astronomy?
• Scales are very large:
What unit do we measure distances in space in?
© 2011 Pearson Education, Inc.
1.1 Our Place in Space
• Astronomy: study of the universe
• Scales are very large: measure in light-years, the distance light travels in a year—about 10 trillion km
© 2011 Pearson Education, Inc.
How fast does light travel in one second?
a. 3 x105 km./sec
b. 300,000 km./sec
c. 30,000 km. sec
d. 3,000 km/sec
© 2011 Pearson Education, Inc.
How fast does light travel in one second?
a. 3 x105 km./sec
b. 300,000 km./sec
Let’s define Light Year
• A unit of interstellar distance, defined as the distance light travels in a period of one year. The speed of light is constant, at about 300,000 km per second or 9.5 trillion km/ year: From an Earthbound perspective, this is a vast distance - our entire Solar System, out to the orbit of Pluto, is only one eight-hundredth of a light year across.
© 2011 Pearson Education, Inc.
Our Place in Space
What is this object?
What is the name of our group?
Share your answer with your elbow partner.
© 2011 Pearson Education, Inc.
Our Place in Space
• This galaxy is about 100,000 light-years across.
A typical galaxy is a collection of a hundred billion stars, each separated by vast regions of nearly empty space. Our Sun is an undistinguished star near the edge of similar galaxy, called the Milky Way.
© 2011 Pearson Education, Inc.
Simplest observation: Look at the night sky
How many stars do you think can be seen with the naked eye on a clear night? Write your answer down on the white board and hold it up?
© 2011 Pearson Education, Inc.
Simplest observation: Look at the night sky
About 3000 stars visible at any one time; distributed randomly but human brain tends to find patterns
© 2011 Pearson Education, Inc.
Constellations
Group stars into constellations: Figures having meaning to those doing the grouping
Useful: Polaris, which is almost due north
Useless: Astrology, which makes predictions about individuals based on the star patterns at their birth
© 2011 Pearson Education, Inc.
Turn to an elbow partner, What are the differences between
Astrology vs. Astronomy?
Astronomy Astrology
© 2011 Pearson Education, Inc.
Turn to an elbow partner, What are the differences between
Astrology vs. Astronomy?
Astronomy
• The study of objects and phenomena beyond the Earth’s Atmosphere
• Goal: to understand the physics of the universe
Astrology
• The belief that the position of the heavenly bodies and celestial events correlate with earthly events and human affairs
© 2011 Pearson Education, Inc.
Constellation Myth project
The purpose behind this project is to create a poster for a constellation that will instruct others on your chosen constellation.
There are 88 constellations to chose from. Please pick from one of the IAU constellations. If your are interested in constellation from other cultures, this would be a great extra credit opportunity.
© 2011 Pearson Education, Inc.
Constellation ProjectPoster requirements
1.Typed report containing scientific requirement and myth must be displayed on the report
2.Constellation visual-must cut out holes in black construction paper to represent stars. Hole size must be representative of the difference sizes of stars in your constellation
3.Full color artwork of your constellation incorporated into the mythical figure
© 2011 Pearson Education, Inc.
There will be a list coming around of the constellations
• Please sign up for constellation that has not been chosen.
© 2011 Pearson Education, Inc.
© 2011 Pearson Education, Inc.
Stars that appear close in the sky may not actually be close in space