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Published byLoren Haynes Modified over 8 years ago
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The Scale of the Universe Lancelot L. Kao Updated: Jan 18, 2010
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2 Heavenly Bodies Angular Measurements Powers-of-Ten, etc Our Solar System Our Sun Stars & Nebulae Galaxies Observable Universe
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3 Angular Measurements Angle & Angular Measure Angular Size Angular Distance Interesting Facts
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4 Angular Size
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5 Angle & Angular Measure 1 degree = 60 arcminutes (minutes of arc) = 60’ 1 arcminute = 60 arcseconds (seconds of arc) = 60”
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6 Angular Distance
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7 Interesting Facts
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8 Powers-of-Ten Large Number 10 = 10 =10 1 100 = 10 x 10 = 10 2 1,000 = 10 x 10 x 10 = 10 3 1,000,000 = 10 6 1 = ? Small Number 0.1 = 1/10 = 10 -1 0.01 = 1/100 = 10 -2 0.001 = 1/1000 = 10 -3 0.000001 = ?
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9 Example of Powers-of-Ten 1,000 x 10,000 = 10,000,000 = 10 3 x 10 4 = 10 7 100,000 x 0.0001 = 10 = 10 5 x 10 -4 = 10 1
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10 Our Solar System
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11 Distance Units in Astronomy 1 astronomical unit = 1 AU = the average distance between the Earth and the Sun 1 light-year = 1 ly = the distance travelled by light in a year 1 parsec = 1 pc = the distance at which 1 AU perpendicular to the observer’s line-of-sight subtends an angle of 1 arcsecond
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12 Units of Length, Time, & Mass Length –English System (inches, feet, yards, miles} –Metric System (centimeters, meters, kilometers) –Astronomy Units (astronomical units, light-years, parsecs, etc) Time –Metric System (seconds, minutes, hours, days, years) Mass –Metric System (grams, kilograms) –Astronomy Units (solar masses)
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13 New Solar System (IAU Resolution 5 for GA-XXVI) IAU General Assembly will vote on this resolution on August 24, 2006 at Prague.
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14 New Solar System!
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15 Our Sun A “typical” star Diameter = 1.39 million kilometers Surface Temperature ~ 5,800 Kelvin Age ~ 4.5 Billion Years Energy Source – thermonuclear fusion
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16 Stars and Nebulae
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17 The Milky Way
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18 Galaxies Stars Star Clusters Gas & Dust Nebulae
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20 Observable Universe
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21 Spaceship Earth
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