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Astronomy Picture of the Day 4-16-03
NASA ^ | 4-16-03 | Robert Nemiroff and Jerry Bonnell

Posted on 04/15/2003 10:24:19 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.

2003 April 16
See Explanation.  Clicking on the picture will download
 the highest resolution version available.

Magma Bubbles from Mt. Etna
Credit & Copyright: Marco Fulle (Stromboli online)

Explanation: Mt. Etna erupted spectacularly in 2001 June. Pictured above, the volcano was photographed expelling bubbles of hot magma, some of which measured over one meter across. One reason planetary geologists study Earth's Mt. Etna is because of its likely similarity to volcanoes on Mars. Mt. Etna, a basalt volcano, is composed of material similar to Mars, and produces similar lava channels. Located in Sicily, Italy, Mt. Etna is not only one of the most active volcanoes on Earth, it is one of the largest, measuring over 50 kilometers at its base and rising nearly 3 kilometers high.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: active; earth; volcano

Vacation Announcement

I will be on vacation from June 2nd through June 9th.
If anyone would like to volunteer to post APOD during that time, please FReepmail me.
Otherwise the APOD will not be posted as I will be visiting relatives in California.


1 posted on 04/15/2003 10:24:20 PM PDT by petuniasevan
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To: MozartLover; Joan912; NovemberCharlie; snowfox; Dawgsquat; viligantcitizen; theDentist; ...

2 posted on 04/15/2003 10:25:05 PM PDT by petuniasevan (Some folks are wise and some otherwise)
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To: All
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3 posted on 04/15/2003 10:26:57 PM PDT by Support Free Republic (Your support keeps Free Republic going strong!)
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To: petuniasevan
Awesome!

Storming by you?

4 posted on 04/15/2003 10:27:20 PM PDT by MozartLover
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To: MozartLover
Loudly.

Sudden rainstorms with lightning and high wind.

What a difference from 8 hours ago!
5 posted on 04/15/2003 10:31:55 PM PDT by petuniasevan (Some folks are wise and some otherwise)
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To: petuniasevan
I know. It dropped from 80 to 50 this afternoon in a matter of, oh, about an hour and half.

Sounds like tomorrow is going to be a REAL mess......

6 posted on 04/15/2003 10:33:34 PM PDT by MozartLover
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To: petuniasevan
Thanks, again!
7 posted on 04/16/2003 6:40:55 AM PDT by foolish-one
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To: petuniasevan
Hi. What does that pic have to do with astronomy??
8 posted on 04/16/2003 11:47:19 AM PDT by graycamel
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To: graycamel
Not all the pics seem to be on-topic. But that's the way that APOD is presented (remember, I don't choose the subject).


Actually, studying Earth volcanoes helps us learn more about volcanoes on other planets, especially Mars. The scars and flow forms left around the extinct calderas there are easier to interpret in light of data from terrestrial volcanoes.
9 posted on 04/16/2003 11:57:08 AM PDT by petuniasevan (Some folks are wise and some otherwise)
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To: petuniasevan
Wow! I can almost feel the heat.
Thanks for the ping.
10 posted on 04/16/2003 5:26:35 PM PDT by sistergoldenhair (Don't be a sheep. People hate sheep. They eat sheep.)
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To: petuniasevan
Thanks for this photo. The flow of heat energy completely through a Mantle and its Crust on this or another planet (or global moon) would look like this photo.

It would be difficult to describe the surface effect of the flow of heat energy through a solid state of matter without photos such as this one. Thanks again.
11 posted on 04/16/2003 8:52:18 PM PDT by Graewoulf
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To: petuniasevan
Not all the pics seem to be on-topic. But that's the way that APOD is presented (remember, I don't choose the subject). Actually, studying Earth volcanoes helps us learn more about volcanoes on other planets, especially Mars. The scars and flow forms left around the extinct calderas there are easier to interpret in light of data from terrestrial volcanoes.

Oh, I didn't think about the possible connection.
12 posted on 04/17/2003 1:30:40 PM PDT by graycamel
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