Astro Unit 5                        Electromagnetic Spectrum

The Three Voices
by Robert W. Service

The waves have a story to tell me,
As I lie on the lonely beach;
Chanting aloft in the pine-tops,
The wind has a lesson to teach;
But the stars sing an anthem of glory
I cannot put into speech.

The waves tell of ocean spaces,
Of hearts that are wild and brave,
Of populous city places,
Of desolate shores they lave,
Of men who sally in quest of gold
To sink in an ocean grave.

The wind is a mighty roamer;
He bids me keep me free,
Clean from the taint of the gold-lust,
Hardy and pure as he;
Cling with my love to nature,
As a child to the mother-knee.

But the stars throng out in their glory,
And they sing of the God in man;
They sing of the Mighty Master,
Of the loom his fingers span,
Where a star or a soul is a part of the whole,
And weft in the wondrous plan.

Here by the camp-fire's flicker,
Deep in my blanket curled,
I long for the peace of the pine-gloom,
When the scroll of the Lord is unfurled,
And the wind and the wave are silent,
And world is singing to world.

See Explanation.  Clicking on the picture will download 
 the highest resolution version available.
 

Stellar Spectral Types: O B A F G K M
Credit & Copyright: KPNO 0.9-m Telescope,
AURA, NOAO, NSF

 


Flavors of Photons

These links contain useful explanations:

       


 

Electromagnetic Spectrum Basics

Blackbodies, Wien's Law and soooo much more!
A blackbody simulator - interactive!

H-R Diagram

The H-R Diagram explained.  A customized Wiki doc.

The Multiwavelength Milky Way

Multiwavelength Astronomy Gallery

All About Spectra.  An awesome site!  Just about everything you would want to know.
Dark Skies Locator
The Night Sky in the World
Jim Terry's Street Lighting Home Page
International Dark Sky Association

What's up?
 

100 Hours of Astronomy is going on from April 2-4.  Live webcasts, online activities.  Check it out!

 

Metro Beach Metropark is hosting a star party on Saturday April 4 from 6-10:30 pm. near the Activity Center.  It's free but there's a $4 vehicle entry fee unless you have a Metroparks sticker.

 

NASA March Madness concludes soon.  How's your bracket coming along?

 

Comet Lulin is still visible.  Check out the observing page for more details.

 

April 22 is the peak date of the Lyrid meteor shower.


Sky Online astro news

Opal on Mars

NASA's Mars Reconnaissance Orbiter located this material which gives strong evidence for past water and possibly life. 
Full story here.

Image Credit: NASA/JPL-Caltech/Univ. of Ariz.
 

Reading Topics:
EM spectrum
Blackbody curves
The Color Rule
Spectra and spectral types
H-R Diagram

Text pages:
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49-52                           56-58
52-54                          58-62
   288-290                      283-286
             55-62                         64-75, 286-288
   288-290                      288-290