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Astronomy Picture of the Day 6-22-02
NASA ^
 | 6-22-02
 | Robert Nemiroff and Jerry Bonnell
Posted on 06/21/2002 9:53:32 PM PDT by petuniasevan
  Astronomy Picture of the Day 
  Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 
2002 June 22 

 Io: The Prometheus Plume 
Credit: Galileo Project, JPL, NASA
 Explanation: Two sulfurous eruptions are visible on Jupiter's volcanic moon Io in this color composite Galileo image. On the left, over Io's limb, a new bluish plume rises about 86 miles above the surface of a volcanic caldera known as Pillan Patera. In the middle of the image, near the night/day shadow line, the ring shaped Prometheus plume is seen rising 45 miles above Io while casting a shadow to the right of the volcanic vent. Named for the Greek god who gave mortals fire, the Prometheus plume is visible in every image ever made of the region dating back to the Voyager flybys of 1979 - presenting the possibility that this plume has been continuously active for at least 18 years. This image was recorded in 1997 on June 28 at a distance of 372,000 miles.
TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: astronomy; flyby; galileo; gravitation; image; io; jovian; jupiter; moon; orbit; photography; planet; prometheus; science; solarsystem; spacecraft; stress; sulfur; tidal; tides; volcanic; volcano
    Io is constantly being "turned inside out" by tidal heating and the resultant volcanic activity.
Get on the APOD PING list! 
 
To: MozartLover; Joan912; NovemberCharlie; snowfox; Dawgsquat; viligantcitizen; theDentist; grlfrnd; ...
    APOD PING! 
 
To: petuniasevan
    How cool, thank you for the ping.
3
posted on 
06/21/2002 10:23:33 PM PDT
by 
trussell
 
To: petuniasevan
    Increible caldera ... thanks 'tunia &;-)
  
Robert Frost - Fire and Ice 
 
  
   
    
Some say the world will end in fire,
Some say in ice.
From what I've tasted of desire
I hold with those who favour fire.
But if it had to perish twice,
I think I know enough of hate
To say that for destruction ice
Is also great
And would suffice. 
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4
posted on 
06/21/2002 11:17:58 PM PDT
by 
2Trievers
 
To: 2Trievers
    Good poem, 2T...Favorite poem by Frost, After APPLE picking!  LOL...no more farm jobs for me...baling hay was enough...that poem is a tribute to those who took the path less travelled to avoid manual labor...Me included!!!Smart boy Robert, Smart Boy!
To: petuniasevan
    I watch this site in awe each day and am thankful that I found it. I want to ask a very simple question...Are the colors shown always the true colors?  This one today is so beautiful...Thanks for bearing with a newbie question.
To: petuniasevan
    APOD Bump! 
 
To: petuniasevan
    That photo looks like a one-eyed Quasimodo.
8
posted on 
06/22/2002 8:44:14 AM PDT
by 
xJones
 
To: petuniasevan
    Io --
 High school chem lab 
 --reaction going to completion.
 
To: BlessedAmerican
    That photo is a color composite (several images taken with different filters, combined) that brings out details.
 I'll post a true-color photo of Io (courtesy of the Galileo spacecraft, too).
 
To: BlessedAmerican
    Your question has been raised quite a few times. 
 The other day I posted an article from NASA concerning Hubble photos which addresses the point.
Here's the link: What Is A True Color Image?
 
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