Download - Astronomy Class Lecture
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George Hrab and the 365 Days of Astronomy Podcast
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The Universe (in one lecture)
Lecture 2Chapter 3.1, 3.2, 3.4
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The Size and Scale of Things
in HD (local file)
By morn1415 on YouTube
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The Size and Scale of Things
Scale Model in Green Bank, WV Voyage Model in DC – Jeffrey Bennett
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The Size and Scale of Things
If the Earth is the size of a ping pong ball, how big is the Sun?
CC Watchcaddy on Flickr
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The Size and Scale of Things
If the Earth is the size of a ping pong ball, how big is the Sun?
Ping pong = 40 mm diameterDiameter Sun = 109 * Diameter of EarthAnalog sun ->
CC Watchcaddy on Flickr
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The Size and Scale of Things
If the Earth is the size of a ping pong ball, how big is the Sun?
Ping pong = 40 mm diameterDiameter Sun = 109 * Diameter of EarthAnalog sun -> ~ 14.3 ft diameter
about the size of this room!
CC Watchcaddy on Flickr
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The Size and Scale of Things
How far away is the ping pong ball from the room?
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The Size and Scale of Things
How far away is the ping pong ball from the room?
Our scale: ~1:160,000,000Distance from Earth to Sun ~ 93 million milesModel distance ->
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The Size and Scale of Things
How far away is the ping pong ball from the room?
Our scale: ~1:160,000,000Distance from Earth to Sun ~ 93 million milesModel distance -> ~3081 ft, or the distance to
the Rotunda
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The Size and Scale of ThingsSun Earth
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The Size and Scale of Things
Mercury Venus Mars
Sun Earth
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The Size and Scale of ThingsJupiterto Mars Saturn
Uranus Neptune Outer Edge of Kuiper Belt
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The Size and Scale of Things
2:37 Sixty Symbols on YouTube Local HD
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The Size and Scale of Things
Now, pretend the Sun is a ping pong ball. Where is the nearest star?
MSX/IPAC/NASA
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The Size and Scale of Things
Now, pretend the Sun is a ping pong ball. Where is the nearest star?
Alpha Centauri (3 star system) 4.2 light years or 1.3 parsecs away2.5 x 1013 miles (25,000,000,000,000 miles)
The ping pong ball would be ->
MSX/IPAC/NASA
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The Size and Scale of Things
Now, pretend the Sun is a ping pong ball. Where is the nearest star?
Alpha Centauri (3 star system) 4.2 light years or 1.3 parsecs away2.5 x 1013 miles (25,000,000,000,000 miles)
The ping pong ball would be -> 714 miles away
MSX/IPAC/NASA
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The Size and Scale of Things
Ping pong ball Ping pong ball
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The Size and Scale of Things
Those are just two nearby ping pong balls in a group of 100 billion, spanning millions of miles
… a galaxy spanning thousands of light years, or hundreds of quadrillions of miles!
Nick Risinger
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HOW do we know?
• Distance to Venus -> radar– The ratios of planetary distances were known, but
an accurate measurement to Venus using the speed of light solidified the numbers
NASA NASA
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HOW do we know?
• Nearby stars measured by parallax
CC NoisyAstronomer
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HOW do we know?
• More distant objects use indirect methods, building a “distance ladder”– Star spectral types– Variable stars– Supernovae– Redshift
Ned Wright
DOE NNSA ASC/Alliance Flash Center at U of Chicago
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The Universal Context
The Millenium Simulation (http://www.mpa-garching.mpg.de/galform/millennium/)
local local better
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The Universal Context
Sloan Digital Sky Survey
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The Universal Context
Tree Lobsters are awesomeMore Perspective
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Expansion
Elementary, my dear Humason!
The further away a galaxy is, the faster it is moving away! Beautifully demonstrated by distant supernovae all the way to large distances measured today.
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Expansion
NASA
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More Evidence of Expansion
WMAP/NASA
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CMB in Context
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More Evidence of Expansion
http://casa.colorado.edu/~ajsh
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H, He, Li… boring universe?http://savillbiology.com/Chemistry.html
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Star Stuff…
All of Cosmos is available for free on Hulu. Seriously, watch it: http://www.hulu.com/cosmos
Csemisery on Youtubelocal
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Stellar Life Cycle
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Molecules in Space
Orion Nebula, NASA/Herschel
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Other Solar Systems
Beta Pic, ESO
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Other Solar Systems
Fomalhaut b, HST/NASA
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Other Solar Systems
There’s an app for that
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How do we know?
It’s all about LIGHT.
Chandra and STSci
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It’s all about LIGHT
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Temperature and Light
Planets and People(300 K)
Stars(1000s K)
Masgatotkaca (Wikimedia)
Hubble, NASA
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Atoms (and molecules) and Light