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 Sep 147:13 AM Sep 147:13 AM 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) Sep 238:56 AM Sep 147:13 AM 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 Sep 147:13 AM 1 Astronomical Distances.notebook Scientific Notation and your Calculator Sep 147:13 AM Scientific Notation and your Calculator Sep 147:13 AM September 23, 2016 Scientific Notation and your Calculator Sep 147:13 AM Scientific Notation and your Calculator Sep 147:13 AM Scientific Notation and your Calculator Sep 147:13 AM Sep 147:58 AM 2 Astronomical Distances.notebook September 23, 2016 Sep 147:58 AM Sep 147:58 AM Sep 147:58 AM Sep 147:58 AM Astronomical Distances Astronomical Unit (abbreviated ________ ): Average distance between the __________ and the ______________. Sep 147:58 AM Sep 147:13 AM 3 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 _________ _____________. Sep 147:13 AM Speed of Light Sep 147:13 AM 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) Sep 147:13 AM Astronomical Distances 9.5 trillion 1 ly = ___________________________ km Scientific Notation = 9.5 x 1012 km 6 trillion miles @ 60 MPH >> 11 million years Sep 147:13 AM 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 Sep 147:13 AM Sep 147:13 AM 4 Astronomical Distances.notebook September 23, 2016 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 Sep 147:13 AM Sep 147:13 AM (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........ Sep 147:13 AM Astronomical Distances Sep 147:13 AM 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 Sep 147:13 AM Sep 147:13 AM 5

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