Astronomical Distances. Stars that seem to be close may actually be very far away from each other.
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Transcript of Astronomical Distances. Stars that seem to be close may actually be very far away from each other.
![Page 1: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/1.jpg)
Astronomical Distances
![Page 2: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/2.jpg)
Stars that seem to be close may actually be very far away from each other.
![Page 3: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/3.jpg)
•The universe is immense in size
•Astronomers use units and methods of measuring that we are not used to on Earth
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•Parallax is used to measure the distance to nearby stars
•Parallax: when objects appear to move or shift due to earth’s orbit
★This method uses trigonometry
★nearby stars = 300 light years or less
![Page 5: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/5.jpg)
Parallax
Jan.
June
draw this
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•Inverse square law of light is used for distant stars
•the intensity of light falls off as the square of the distance from the source
![Page 7: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/7.jpg)
•Light year is a unit of distance, NOT time
•Light Year: the distance light travels in one year (9.5 trillion km!!!)
★Kilometers are too small to use in astronomy
★one light-year is equal to 9,500,000,000,000 kilometers.
![Page 8: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/8.jpg)
Light Year
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•Parsec is used to measure greater distances between stars and galaxies
•1 parsec = 3.26 light years
![Page 10: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/10.jpg)
•Astronomical Units (AUs) measure distances between planets (our solar system)
•AU is the average distance between the Earth and Sun (1 AU)
★1 AU is about 150 million km
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★Mercury is the closest at 0.39 AUs while Neptune is the farthest at 30.06 AUs
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1 AUSun E
draw this
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60 second summary
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Review#1 What is parallax used for?
•to measure a star’s temperature
•to measure a star’s distance from Earth
•to measure a star’s mass
•to measure a star’s magnitude
![Page 15: Astronomical Distances. Stars that seem to be close may actually be very far away from each other.](https://reader036.fdocuments.in/reader036/viewer/2022062500/56649f065503460f94c1b2b1/html5/thumbnails/15.jpg)
๏parallax measures a star’s distance from earth
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Review#2 What does a light year
measure?•temperature
•time
•distance
•magnitude
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๏distance
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Reviw#3 An AU is used for distances
between...•stars
•galaxies
•solar systems
•planets
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๏planets
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Review#4 Which measurement is used for distant
stars?•AU
•parallax
•inverse square law of light
•light year
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๏inverse square law of light