### Astronomical Distances.notebook

```Astronomical Distances.notebook
Astronomical Distances
September 23, 2016
Scientific Notation
150 million km = ____________________ km
150 with ________ spaces (zero’s in this case) behind it
Scientific Notation = 150 x 10
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Scientific Notation
Thousand = 103 (whole number followed by 3 spaces)
Million = 106 (whole number followed by 6 spaces)
Billion = 109 (whole number followed by 9 spaces)
Trillion = 1012 (whole number followed by 12 spaces)
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Scientific Notation
Scientific Notation
Example #1: 7 x 106 = Example #2: 7.4 x 106 = On your own....
Example #4: 21.3 x 109 = Example #3: 150 x 106 = Sep 14­7:13 AM
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Astronomical Distances.notebook
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Astronomical Distances.notebook
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Astronomical Distances
Astronomical Unit (abbreviated ________ ):
Average distance between the __________ and the ______________.
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Astronomical Distances.notebook
Astronomical Distances
Astronomical Unit (AU):
1 AU = ___________________________ km
September 23, 2016
Astronomical Distances
Light Year (abbreviated ________ ):
Distance a beam of light can travel in
_________ _____________.
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Speed of Light
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Astronomical Distances
300,000,000 m/s (300 x 106 m/s)
Light Year (ly):
3 x 108 m/s (3 with 8 spaces after it)
300,000 km/s (scientific notation = ___________ km/s)
Takes ______ second for light reflected from the moon to reach Earth.
Takes ______ minutes for light energy from the Sun to reach Earth.
Fun Fact: Speed of Sound = 343 m/s
(770 MPH)
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Astronomical Distances
9.5 trillion
1 ly = ___________________________
km
Scientific Notation =
9.5 x 1012 km
6 trillion miles
@ 60 MPH >> 11 million years
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Astronomical Distances
pc
parsec (abbreviated ______ ):
Light Year (ly):
63,000
1 ly = ____________________
AU
Distance an observer would have to be in
parallax
1 AU
order for a ___________________ of to form an angle of 1 arc second (arcsec)
Name = Parallax of 1 arcsec
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Astronomical Distances.notebook
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arcsec
Parallax
Difference in the apparent position of an object viewed from two different lines of sight
1 arcsec = 1/3600 of a degree
1 arcsec = 0.00028o
very small
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(same object.... with an apparent shift)
1 arcsec
1 AU
1 arcsec
1 AU
Observer
Observer
Drawing not to scale J
We would have to move WAY back
for the parallax to appear only 1
arcsec apart. How far........
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Astronomical Distances
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Astronomical Distances
parsec (pc):
parsec (pc):
31 trillion
1 pc = ___________________________
km
206,000
1 pc = ____________________
AU
Scientific Notation =
31 x 1012 km
3.26
1 pc = _____________
ly
19 trillion miles
@60 MPH >> 36 million years
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