Our Universe in Space (intro survey). Our solar system’s scale Convenient distance unit for the...
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![Page 1: Our Universe in Space (intro survey). Our solar system’s scale Convenient distance unit for the solar system: the AU The astronomical unit (AU) is the.](https://reader035.fdocuments.us/reader035/viewer/2022070408/56649e555503460f94b4c0a2/html5/thumbnails/1.jpg)
Our Universe in Space
(intro survey)
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Our solar system’s scale
Convenient distance unit for the solar system: the AU
The astronomical unit (AU) is the average Earth-Sun distance.
1 AU ≈ 150 million kilometers or 93 million miles
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MercuryVenusMarsJupiterSaturn
Visible, known to ancients
Uranus – William Herschel 1781
Neptune – predicted Urbain Le Verrier observed Johann Galle 1846
Pluto – predicted Percival Lowell observed Clyde Tombaugh 1930
– demoted to ‘dwarf planet’ 2006
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JovianTerrestrial
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jupiter
earth
Sol
D
D
D
74.9
109
km 1092.13 5
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Mars210 ft
Earth138 ft
Inner solar-system
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Jupiter719 ft
Saturn1320 ft
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Uranus2651 ft
Neptune4153 ft
‘Pluto’5453 ft
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How far to nearest star?
Convenient distance unit for interstellar scales: the ly
The Light-Year (ly) is the distance light travels in one year.
1 ly ≈ 9 trillion kilometers or about 6 trillion miles(9.461×1012 km)
1 ly ≈ 63,241 AU
Interstellar Scales
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4.242 ly
4.365 ly~ 3.5˚
Sun
a Centauri A
a Centauri B
Proxima Centauri
~0.2 ly(10,000-20,000 AU)
~ 25 AU
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Model for Sol- a Centauri separation
Now let’s pretend that Sol was the size of our ball-bearing …
then 4 ly would be 80.3 mi !!
then out to Pluto would be 66 feet
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Our Galaxy
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The Milky Way
100 to 400billion stars!!
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CD Model for the Milky Way
4.75 in
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CD Model for the Milky Way
Interstellar distances …4 ly ≈ 5×10-5 in ~ 10-4 cm ~ 1 mm
~ 1/10 red blood cell
An AU ~ 1 mm/63,241 ~ 10-11 m
~ 1/10 H atom
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Intergalactic distances
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The Local Group
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The Local Group
100,000 ly
220,000 ly
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The Local Group
100,000 ly
2,500,000 ly
220,000 ly Note: our book says “about 100,000”
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4.75 in(100 kly)
10.5 in(220 kly)
119 in or 9 ft 11 in
(2.5 Mly)
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(Hercules cluster)
Other clusters of galaxies
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Other clusters of galaxies ‘near’ us
Diameter 800 Mly
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(Hubble deep-field - Fornax)
Lots of Galaxies !!!
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APOD: The galaxies pictured above are part of a cluster of galaxies called ACO 3627 near the center of the Great Attractor. Previously, this cluster of galaxies, also known as the Norma Cluster, was largely unstudied because dust in the disk of our own Galaxy obscured much of its light. The Great Attractor is a diffuse mass concentration fully 250 million light-years away, but so large it pulls our own Milky Way Galaxy and millions of others galaxies towards it. Many of the galaxies in ACO 3627 are slowly heading towards collisions with each other.
The Great Attractor
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Large-scale structure of the universe?
Sloan 2 degree galactic redshift survey ….
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62,559 galaxies!
( 1 pc ~ 3.3 ly )
(3.3 billion ly )
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Observable size of (our) universe
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Q: Why is the night sky dark??
• Finite universe?• Finite age of universe?• Other
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A: The universe hasn’t lasted forever.
Age of the universe ~ 14 billion years (13.82 billion years latest estimate)
We can’t see anything older than 14 billion light years
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gamma-ray burst known as GRB 090429B NASA's Swift satellite (29 April 2009)
~13.095 billion ly
Newest: EGSY8p7 13.2 billion ly
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Q: How big’s the universe?
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A: ∞
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