Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

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

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!

1 posted on 06/21/2002 9:53:33 PM PDT by petuniasevan
[ Post Reply | Private Reply | View Replies]

To: MozartLover; Joan912; NovemberCharlie; snowfox; Dawgsquat; viligantcitizen; theDentist; grlfrnd; ...
APOD PING!
2 posted on 06/21/2002 9:54:20 PM PDT by petuniasevan
[ Post Reply | Private Reply | To 1 | View Replies]

To: petuniasevan
How cool, thank you for the ping.
3 posted on 06/21/2002 10:23:33 PM PDT by trussell
[ Post Reply | Private Reply | To 2 | View Replies]

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. 

4 posted on 06/21/2002 11:17:58 PM PDT by 2Trievers
[ Post Reply | Private Reply | To 2 | View Replies]

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!
5 posted on 06/21/2002 11:53:35 PM PDT by sleavelessinseattle
[ Post Reply | Private Reply | To 4 | View Replies]

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.
6 posted on 06/22/2002 5:01:38 AM PDT by BlessedAmerican
[ Post Reply | Private Reply | To 1 | View Replies]

To: petuniasevan
APOD Bump!
7 posted on 06/22/2002 7:46:55 AM PDT by MeekOneGOP
[ Post Reply | Private Reply | To 1 | View Replies]

To: petuniasevan
That photo looks like a one-eyed Quasimodo.
8 posted on 06/22/2002 8:44:14 AM PDT by xJones
[ Post Reply | Private Reply | To 1 | View Replies]

To: petuniasevan
Io --

High school chem lab

--reaction going to completion.

9 posted on 06/22/2002 12:51:03 PM PDT by RightWhale
[ Post Reply | Private Reply | To 1 | View Replies]

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).


10 posted on 06/22/2002 1:19:29 PM PDT by petuniasevan
[ Post Reply | Private Reply | To 6 | View Replies]

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?

11 posted on 06/22/2002 1:24:28 PM PDT by petuniasevan
[ Post Reply | Private Reply | To 6 | View Replies]

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson