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Astronomy News
#21
John: We, as a species, have a number of orbitals around Mars. We'll quite likely lose them anyway if Mars crosses "C/2013 A1's" coma.

"Where's the Kaboom! There was supposed to be a Mars shattering Kaboom!"
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#22
The coma should be little more than very tenuous gas and vapor.
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#23
John L, I believe that if a comet passes within the inner solar system, it is a short-period comet. Even Halley's Comet, which passes near earth every 75-76 years, is regarded as a short-period comet.

Link: http://en.wikipedia.org/wiki/Halley%27s_Comet
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#24
Some religious reinforcement. S6
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#25
That article didn't address anything religious: New gods, or the old gods:

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#26
(03-05-2013, 09:16 PM)WmLambert Wrote: That article didn't address anything religious...
Sure did: Panspermia. There is no God but spermotoxicosis and comets are his messengers.
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#27
(03-05-2013, 08:06 PM)Ron Lambert Wrote: The coma should be little more than very tenuous gas and vapor.

And dust and gravel... like a shotgun firing faster than orbital velocity.

That being said, space is big. Really Really big. So maybe all our orbitals will be just fine.
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#28
(03-06-2013, 07:01 PM)Pixiest Wrote:
(03-05-2013, 08:06 PM)Ron Lambert Wrote: The coma should be little more than very tenuous gas and vapor.

And dust and gravel... like a shotgun firing faster than orbital velocity.

That being said, space is big. Really Really big. So maybe all our orbitals will be just fine.

That's right "P", and even if it doesn't break up, the outgassing always throws out hard debris.

Here's an interesting note. That space probe we sent out a few years ago(forgotten which one) actually did hit the comet and was able to determine its composition. And it contained less water than originally thought. So its possible that comets have less water and more solids than earlier thought.

Or there could be mixtures. But the point is that there is an awful lot of solid material in a comet to really cause serious trouble if it is on a one-way collision course. S22
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#29
Anything pebble-sized would burn up in the atmosphere, even the relatively thin atmosphere of Mars.
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#30
(03-07-2013, 02:32 PM)Ron Lambert Wrote: Anything pebble-sized would burn up in the atmosphere, even the relatively thin atmosphere of Mars.

We usually put our orbiters above the atmosphere =)
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#31
(03-07-2013, 03:24 PM)Pixiest Wrote:
(03-07-2013, 02:32 PM)Ron Lambert Wrote: Anything pebble-sized would burn up in the atmosphere, even the relatively thin atmosphere of Mars.

We usually put our orbiters above the atmosphere =)

I was just thinking that very same thing "P". We obviously think alike in many things. S22

I can well remember the concern over a small pebble entering and exiting the International Space Station a little while back. Something even that small, is traveling at very high speed, and possesses incredible kinetic energy.

Quote:WSJ Market Watch Oct.19, 1212 - A meteor shower caused by debris left behind by the famous Halley’s comet peaks this weekend as the Earth’s orbit brings the planet through a trail of cosmic dust.

The Orionid meteor shower could provide a visual treat in areas of the U.S. with clear skies, mostly outside big metropolitan areas.

Quote:
First-time and long-time meteor showers in forecast Dec.11, 1212

Look to the heavens this week and you may see something no earthling has seen before – meteors from the comet Wirtanen.

The comet was discovered in 1948 and orbits the sun every 5.4 years, but 2012 will mark the first time the Earth's orbit will cross the comet's debris field, possibly producing meteors, according to a NASA press release.

And don't forget the Leonid debris field[comet 55p/Tempel -Tuttle) the planet goes through every year.
These things are wonderful, and look so cute,...........within the atmosphere. But in space,............they are potential killers.
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#32
Oh yes, of course, there would be a danger to anything we have orbiting in space. But still, do not underestimate how very, very, super thin is the tail of a comet, spread out over thousands of miles in width and height as well as length.
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#33
http://www.space.com/20111-mars-megafloo...radar.html
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#34
That is really neat. Unlike our planet, mars' vulcanization seems to be halted, so there are obviously huge amounts of underground lava tubes and reservoirs where gigantic amounts of water could be sequestered.

Its going to be exciting when humans start exploring the red planet. And under the surface will be where most of the excitement will come from IMO.

Incidentally did anyone see the article on all of the caves and lava tubes recently discovered?

[Image: pavonis-mons-skylight.jpg]
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#35
It spawned! Gah

[Image: comet-panstarrs-lemmon-670x440-130306.jpg]

http://news.discovery.com/space/astronom...130306.htm
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#36
One more beautiful shot from SpaceWeather.com

[Image: John-Sarkissian-Comet_Panstarrs_5March20...010_lg.jpg]
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#37
http://news.discovery.com/space/alien-li...130306.htm
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#38
@john: perhaps sticky this thread and also start one for Biology: there are some intriguing things lately, cf. http://blogs.scientificamerican.com/gues...ice-smart/
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#39
Done. I also started a geology news thread.
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Hillary Clinton Is Like Herpes, "She Wont Go Away" - Anna Paulina
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#40
Not sure you will find many posts there ... geology news are uncommon ... I can only think of recent oil/gas finds plus the Indian Ocean minicontinent story.

perhaps we should also have "Religious News" somewhere... Ahmadinejad's prediction about Chavez would qualify...
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