--- Christopher England [EMAIL PROTECTED] wrote:
Europa places the same face to Jupiter all of the
time, as do most
satellites. I guess that it's the tidal heating
that eventually
dissipates the rotational energy. I don't know of
any other mechanism.
Jupiter doesn't continually flex
I just got through with watching a DVD from my
Cosmos box set -- episode VI, Traveller's Tales,
which is focused on the Voyager spacecraft. There's
a great segment in it featuring the scientists
working at JPL in Pasedena on the day when mankind
got its first close-up pictures of Europa.
Obligatory quote from It's a Wonderful Life:
George Bailey: What do you want, Mary? Do you
want the moon? If you want it, I'll throw a
lasso around it and pull it down for you. Hey!
That's a pretty good idea! I'll give you the
moon, Mary.
Mary: I'll take it! Then
--- Michael Turner [EMAIL PROTECTED] wrote:
I don't know how much perturbation is expected, but
remember that
the center of mass is about 23,000 miles out. At
those distances,
GEO satellites carry rather small engines to correct
for perturbations
that accumulate over *decades* of
Scientists envision sending a huge, 300-foot-long,
nuclear-powered craft -- called JIMO, for Jupiter
Icy Moons Orbiter -- on a voyage to the Jovian
neighborhood to spend up to five years circling the
ice-encrusted moon called Europa, plus two others,
Callisto and Ganymede, which also are
From the article:
You have no idea how this feels, he said. I mean,
you just don't know. I woke up this morning and I
said to myself when I wake up tomorrow, on Sunday,
the world will be different. And it really, really
is. It's completely different. This is a tremendous
day.
This is
[On the subject of non-Europa posts: on other
mailing lists, I've seen the convention of labelling
posts that aren't directly concerned with the subject
at hand with an OT: (meaning Off Topic)at the
start of the subject line. This makes it easier for
people who aren't interested to spot (and
FWIW, the cover article on this month's National
Geographic (at least here in Singapore) is about the
possibility of hiding in the Martian ice. Haven't
perused the article yet but I'm sure there's some
content directly relevent to Europa...
Couldn't find reference to the article on their
A very nice article about building a probe to melt
through Europa's ice.
http://news.bbc.co.uk/2/hi/science/nature/3548139.stm
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--- Michael Turner [EMAIL PROTECTED] wrote:
In any case, the ghost of Lowell could still use
some exorcism. Arthur C.
Clarke, less than a year ago, said over the wire at
some conference that he
was sure he saw something in recent surface images,
evidence of life gosh
darn it. Clarke's a
I came across this article...
http://www.space.com/missionlaunches/missions/europa_colonies_010606-1.html
... which talks about what it would take to
support humans on Europa. A lot of that article
seems to be gleaned from this article on the
Artemis Society's web site:
I can buy parallel evolution producing similar
shapes of creatures. But the plants being green
strikes me as a particularly Earth-born conceit.
Even if the ice wasn't kilometers thick, I doubt
enough sunlight reaches Europa to make photo-
synthesis via chlorophyll a useful process...
--- LARRY
From
http://www.astronomy.com/Content/Dynamic/Articles/000/000/001/738lbwsc.asp;
-- probably nothing you don't already know... Go to
the link to see an artistr's concept of the JIMO
spacecraft approaching Jupiter.
Heading back to Jupiters moons
NASA has started planning an ambitious
I read elsewhere that some scientists are disappointed
that it appears that Titan's surface isn't liquid (it
would have appeared brighter, apparently, if it were).
They're now guessing ice. Might this actually be a
boon to future Europa missions? Huygens will have to
do an ice landing instead
--- LARRY KLAES [EMAIL PROTECTED] wrote:
From: DwayneDay
I also have a somewhat wistful article on how the
space community could really use another Carl Sagan:
http://www.thespacereview.com/article/192/1http://www.thespacereview.com/article/192/1
I quote from that article:
The hottest late
--- Michael Turner [EMAIL PROTECTED] wrote:
Why would Europa look like this in a brief melt?
A brief melt amounts
to the Sun going nova, and Europa's surface would
turn into the surface of
one big ocean, boiling away under the combination of
nova heat and the
vacuum of space. Nothing
Today's is another Europa shot:
http://antwrp.gsfc.nasa.gov/apod/ap041218.html
Explanation: This bright white swath cutting across
the surface of icy Jovian moon Europa is known as
Agenor Linea. In all about 1000 kilometers long and 5
kilometers wide, only a section is pictured here as
part of
]
- Original Message -
From: Mark Schnitzius [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, December 18, 2004 6:25 PM
Subject: Astronomy Picture of the Day
Today's is another Europa shot:
http://antwrp.gsfc.nasa.gov/apod/ap041218.html
Explanation: This bright white
I heard somewhere that they think these rocks
are actually chunks of ice. Can anyone confirm
this, or do they even know yet?
Also, even if they're rocks, they're large pebbles
at best; that prominent rock in the center of the
main surface photo is, judging from what I've read,
about golf-ball
--- Michael Turner [EMAIL PROTECTED] wrote:
This whole Huygens episode considerably exceeded my
expectations. I
half-expected permanent loss of contact within the
atmosphere, or that if it
did communicate on the way down, signals would be
scrambled, and anyway if
it did communicate
--- Michael Turner [EMAIL PROTECTED] wrote:
Science reporting is really too exacting to be left
to mere ... science
reporters.
http://www.washingtonpost.com/wp-dyn/articles/A27812-2005Jan21.html
While the guy did point out some valid errors, I found
myself not agreeing with some of the
When the director James Cameron proclaimed himself
king of the world on winning the Oscar for
Titanic, who knew that he also had designs on the
rest of the solar system? His newest film, Aliens of
the Deep, is a grandiose hybrid of undersea
documentary and outer-space fantasy that begins on our
--- Joseph Z. [EMAIL PROTECTED] wrote:
Why would a species out there that was enjoying a
eutopian existance even
want to communicate with a planet of
self-destructive apes?
The worst cliche in science fiction, I think, is the
tired story of an alien race that discovers humans,
decides
Sad. Could you imagine him saying something like
*economics* isn't his strong point? For some reason
it's okay to be bad at science.
Maybe Bush could give him a quick primer the next time
he visits. I understand he minored in astrophysics.
The worst world leader in this regard, imho, is
When you want something really badly, the tendency
is toward optimism. The fact there seems to be not
a lot of that here about a Europa mission really
gives one pause. We have a long way to go.
I have little faith that the US will ever fund a
another mission on the order of Cassini. But the
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