Free Republic
Browse · Search
News/Activism
Topics · Post Article

Skip to comments.

Jupiter Increases Risk Of Comet Strike On Earth
New Scientist ^ | 8-24-2007 | David Shiga

Posted on 08/24/2007 1:21:38 PM PDT by blam

Jupiter increases risk of comet strike on Earth

11:53 24 August 2007
NewScientist.com news service
David Shiga

Earth experienced an especially heavy bombardment of asteroids and comets early in the solar system's history (Illustration: Julian Baum)

Contrary to prevailing wisdom, Jupiter does not protect Earth from comet strikes. In fact, Earth would suffer fewer impacts without the influence of Jupiter's gravity, a new study says. It could have implications for determining which solar systems are most hospitable to life.

A 1994 study showed that replacing Jupiter with a much smaller planet like Uranus or Neptune would lead to 1000 times as many long-period comets hitting Earth. This led to speculation that complex life would have a hard time developing in solar systems without a Jupiter-like planet because of more intense bombardment by comets.

But a new study by Jonathan Horner and Barrie Jones of Open University in Milton Keynes, UK, shows that if there were no planet at all in Jupiter's orbit, Earth would actually be safer from impacts.

The contradictory results arise because Jupiter affects comets in two different, competing ways. Its gravity helps pull comets into the inner solar system, where they have a chance of hitting Earth, but can also clear away Earth-threatening comets by ejecting them from the solar system altogether, via a gravitational slingshot effect.

Tripled impacts

According to the new study, the worst scenario for Earth is when Jupiter is replaced by a planet with about the mass of Saturn. "[Such a planet] is fairly capable of putting things into an Earth-crossing orbit, but still has some difficulty ejecting them, so they will stay on an Earth-crossing orbit for a much longer time," Horner told New Scientist. The projected result was more than three times as

(Excerpt) Read more at space.newscientist.com ...


TOPICS: News/Current Events
KEYWORDS: catastrophism; comet; jupiter; strike; tvf; worldsincollision; xplanets
Navigation: use the links below to view more comments.
first 1-5051-85 next last

1 posted on 08/24/2007 1:21:42 PM PDT by blam
[ Post Reply | Private Reply | View Replies]

To: SunkenCiv

Catastrophism Ping.


2 posted on 08/24/2007 1:22:13 PM PDT by blam (Secure the border and enforce the law)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

Were all going to die!!!!!! Soon.


3 posted on 08/24/2007 1:23:17 PM PDT by dforest (Duncan Hunter is the best hope we have on both fronts.)
[ Post Reply | Private Reply | To 2 | View Replies]

To: blam

Damn Jovians!


4 posted on 08/24/2007 1:24:18 PM PDT by ozzymandus
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

Bushs’ fault


5 posted on 08/24/2007 1:25:01 PM PDT by clamper1797 (Tonkin Gulf Yacht Club 72-73 ... USS Midway CVA-41 VA-93 Blue Blazers)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

#####Jupiter Increases Risk Of Comet Strike On Earth#####

Then we’re all in agreement.....Jupiter must be destroyed!


6 posted on 08/24/2007 1:25:14 PM PDT by puroresu
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

OK, Jupiter is going on my list then.


7 posted on 08/24/2007 1:25:14 PM PDT by ansel12 (It is time we "take Out" the Jupiter)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

Personally I suspect that Jupiter flings as many comets and asteroids away from the center of the solar system as it flings toward it.

I’m declaring this glass half full.


8 posted on 08/24/2007 1:25:19 PM PDT by cripplecreek (Greed is NOT a conservative ideal.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

It’s a catsasstrophy in the making. Bush should order a pre-emptive strike on Jupiter. I never did trust those Jovians. Something about those three eyes looking at me I never did trust.


9 posted on 08/24/2007 1:26:37 PM PDT by BipolarBob (Yes I backed over the vampire, but I swear I didn't see it in my rear view mirror.)
[ Post Reply | Private Reply | To 2 | View Replies]

To: blam

Conservation, it’s the only solution. We need to turn our economy over to government planners who will regulate consumption. Too much is at stake to even argue about this.


10 posted on 08/24/2007 1:27:08 PM PDT by ElkGroveDan (When toilet paper is a luxury, you have achieved communism.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

Hurry, buy some Jupiter credits from Algore!!!


11 posted on 08/24/2007 1:27:16 PM PDT by Leo Carpathian (ffffFReeeePeee!)
[ Post Reply | Private Reply | To 1 | View Replies]

To: puroresu
Then we’re all in agreement.....Jupiter must be destroyed!

Can we at least keep Europa?

12 posted on 08/24/2007 1:27:53 PM PDT by Drew68
[ Post Reply | Private Reply | To 6 | View Replies]

To: clamper1797

Isn’t he a Methodist?


13 posted on 08/24/2007 1:28:11 PM PDT by badpacifist ("I don't think you understand these boys killed my dog" Bob Lee Swagger)
[ Post Reply | Private Reply | To 5 | View Replies]

To: blam

So, what do they want to do about it, destroy Jupiter?

Yeah, like that would solve the problem.

Scientist, can’t live with them, but could we try living without them?


14 posted on 08/24/2007 1:29:32 PM PDT by Shadowstrike (Be polite, Be professional, but have a plan to kill everyone you meet.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

“If there were no planet at all in Jupiter’s orbit, Earth would actually be safer from impacts.”

If there were no planet at all in the solar system, there would be far, far fewer impacts!


15 posted on 08/24/2007 1:30:06 PM PDT by PetroniusMaximus
[ Post Reply | Private Reply | To 1 | View Replies]

To: puroresu

Can’t it just be deflated? I mean, being gas and all...


16 posted on 08/24/2007 1:30:15 PM PDT by Larry Lucido (Hunter 2008)
[ Post Reply | Private Reply | To 6 | View Replies]

To: blam

Typical of the Bush administration. After 6 1/2 years, he’s done absolutely nothing to implement the 1994 recommendation that Jupiter be replaced by a smaller gas giant planet. Just like with the Kyoto Protocols...


17 posted on 08/24/2007 1:31:42 PM PDT by Verginius Rufus
[ Post Reply | Private Reply | To 1 | View Replies]

To: Shadowstrike

“Mr. President, the good news is we’ve destroyed Jupiter. The bad news is, we now have a thousand pieces of Jupiter on earth-intersecting trajectories.”


18 posted on 08/24/2007 1:31:57 PM PDT by Larry Lucido (Hunter 2008)
[ Post Reply | Private Reply | To 14 | View Replies]

To: blam

Just when I was coming to grips with the sun swelling up and consuming us, and now this!! I guess I’d better go home and finish off that carton of Blue Bell.


19 posted on 08/24/2007 1:32:19 PM PDT by ontap (Just another backstabbing conservative)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

****WARNING! This comment has no real relevance to the subject of the thread WARNING!****

Well heck. We obviously need some legislation to protect us from such nastiness.

Maybe the UN could publish a notice condemning Israel for it’s obvious involvement in the plot.

Will Bushilter McHalibturton stoop to no low in his evil drive to wipe out Amerikkkan freedom to commit treason?


20 posted on 08/24/2007 1:32:45 PM PDT by Grimmy (equivocation is but the first step along the road to capitulation)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Larry Lucido

Hey! Why don’t we just burn it in our cars?


21 posted on 08/24/2007 1:33:31 PM PDT by ontap (Just another backstabbing conservative)
[ Post Reply | Private Reply | To 16 | View Replies]

To: blam

‘Blam !’ is the sound a comet makes when it strikes the earth. Nicht wahr?


22 posted on 08/24/2007 1:34:06 PM PDT by ex-Texan (Matthew 7: 1 - 6)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam

Just like a policeman, where’s Dr. Who when you need him?


23 posted on 08/24/2007 1:34:41 PM PDT by lilylangtree (Veni, Vidi, Vici)
[ Post Reply | Private Reply | To 1 | View Replies]

To: blam
I’ve got an answer for this risk —

Raise taxes; grow Government; elect Democrats; and, destroy American capitalism.

I wanted to get that out before the leftists beat me to it.

24 posted on 08/24/2007 1:34:54 PM PDT by vetsvette (Bring Him Back)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Larry Lucido; Drew68

We may have to leave Jupiter intact. Some creature has stolen the Illudium 236 Space Modulator!


25 posted on 08/24/2007 1:36:25 PM PDT by puroresu
[ Post Reply | Private Reply | To 16 | View Replies]

To: ontap

I use it in my Saturn. I used to burn it in my Comet! Personally, I would just send it to the Ford Galaxy.


26 posted on 08/24/2007 1:36:34 PM PDT by Larry Lucido (Hunter 2008)
[ Post Reply | Private Reply | To 21 | View Replies]

To: ozzymandus
It rymes with Rovians!!!! I knew it, Jupiter is a neoconservative, right-wing Christian theocon conspiracy to advance a busthitler police state!!!

We need to stop the neo-jovian menace!!! We can do this by instituting a “fairness doctrine” to ensure those evil VRWC (tm) fascists do not question us like they do man-made global warming (established without a doubt by Hollywood and Gore). They need to respect leftist free-speech and we cannot allow them to speak and spread their lies. We need to then institute a total gun ban to disarm the conservatives. We need even more welfare and government funding for midnight basketball and Islamic footbaths at universities since the Islamics are much better at understanding the cosmos as they worship a lunar god. We then need to “re-educate” the conservatives until they understand that the neo-Jovian threat is bad and must be destroyed (without nuclear weapons of course).

Then we will unilaterally invade Pakistan if they harbor a neo-Jovian (forget this Coalition of 30+ countries Bushitler “unilaterally” invaded iraq with).

/Sarcasm (Like that was not apparent)

Actually, I think 85% of what I wrote above would fly without question at Kos or DU....

27 posted on 08/24/2007 1:38:39 PM PDT by M1Tanker (Proven Daily: Modern "progressive" liberalism is just National Socialism without the "twisted cross")
[ Post Reply | Private Reply | To 4 | View Replies]

To: Larry Lucido

One of these days I am going to learn not to click on these threads while drinking my afternoon soda


28 posted on 08/24/2007 1:39:34 PM PDT by Domandred (Eagles soar, but unfortunately weasels never get sucked into jet engines)
[ Post Reply | Private Reply | To 18 | View Replies]

To: Larry Lucido

It’s a universal fuel!


29 posted on 08/24/2007 1:41:30 PM PDT by ontap (Just another backstabbing conservative)
[ Post Reply | Private Reply | To 26 | View Replies]

To: Domandred

Jove you magnificent bastard


30 posted on 08/24/2007 1:42:15 PM PDT by daku ("My dream continues with ferocity, thank you.")
[ Post Reply | Private Reply | To 28 | View Replies]

To: blam

Are we all Dooooomed (tm) yet ?


31 posted on 08/24/2007 1:46:03 PM PDT by farlander (Try not to wear milk bone underwear - it's a dog eat dog financial world)
[ Post Reply | Private Reply | To 1 | View Replies]

To: cripplecreek
On a more serious note, I believe you are correct. There is no telling what the Martian-Jovian asteroid belt would look like if it were not for Jupiter. Also, there is no telling how many comets and other objects Jupiter has deflected from the Ort Cloud or extra-solar areas.

Well, actually, without Jupiter (or equally massive body: insert Rosie/Moore jokes), the asteroid belt may collapse and the inner planets might be pulverized.

Jupiter's position is like stopping a terrorist attack. Few are happy when we are successful at stopping one, but everyone is angry when we fail.

32 posted on 08/24/2007 1:47:41 PM PDT by M1Tanker (Proven Daily: Modern "progressive" liberalism is just National Socialism without the "twisted cross")
[ Post Reply | Private Reply | To 8 | View Replies]

To: indylindy

“...Were all going to die!!!!!! Soon....”

Not as soon as John Evander Couey will.


33 posted on 08/24/2007 1:48:53 PM PDT by NCC-1701 (PUT AN END TO ORGANIZED CRIME. ABOLISH THE I.R.S.)
[ Post Reply | Private Reply | To 3 | View Replies]

To: PetroniusMaximus

“...If there were no planet at all in the solar system, there would be far, far fewer impacts!...”

Planets don’t cause impacts. Asteroids cause impacts.


34 posted on 08/24/2007 1:50:08 PM PDT by NCC-1701 (PUT AN END TO ORGANIZED CRIME. ABOLISH THE I.R.S.)
[ Post Reply | Private Reply | To 15 | View Replies]

To: blam

Al Gore should get on this immediately! It’s another “inconvenient truth”.


35 posted on 08/24/2007 1:50:47 PM PDT by beethovenfan (If Islam is the solution, the "problem" must be freedom.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: NCC-1701

“Planets don’t cause impacts.”

Yes... but if there were no planets to impact with, think of how many fewer planetary impacts there would be!!!!


36 posted on 08/24/2007 1:56:25 PM PDT by PetroniusMaximus
[ Post Reply | Private Reply | To 34 | View Replies]

To: PetroniusMaximus

Now that’s a thought. Let’s get rid of ALL planets, except good ole Earth.


37 posted on 08/24/2007 1:59:28 PM PDT by NCC-1701 (PUT AN END TO ORGANIZED CRIME. ABOLISH THE I.R.S.)
[ Post Reply | Private Reply | To 36 | View Replies]

To: blam

Lousy Jupitarians...


38 posted on 08/24/2007 2:00:04 PM PDT by KingSnorky
[ Post Reply | Private Reply | To 1 | View Replies]

To: NCC-1701
Planets don’t cause impacts. Asteroids cause impacts.

When asteroids are outlawed only outlaws will have asteroids!

39 posted on 08/24/2007 2:03:14 PM PDT by OSHA (Liberals will lick the boot on their necks if they think the other boot is on yours and mine.)
[ Post Reply | Private Reply | To 34 | View Replies]

To: NCC-1701

Now now, don’t be planetist, saying that one planet is better than any other.

Now you’ve gone and hurt Mercury’s feelings.


40 posted on 08/24/2007 2:08:47 PM PDT by Vesuvian ((insert something witty here))
[ Post Reply | Private Reply | To 37 | View Replies]

To: indylindy; SpinnerWebb
Were all going to die!!!!!! Soon.

Don't know about "soon" ... some will be sooner, some later ... but the truth is, we are all going to die.

tx_eggman® ... spreading good cheer one reply at a time.

41 posted on 08/24/2007 2:09:38 PM PDT by tx_eggman (ManBearPig '08)
[ Post Reply | Private Reply | To 3 | View Replies]

To: Vesuvian

Geee, I’m sorry about that. How TOTALLY un-pc of me.


42 posted on 08/24/2007 2:11:48 PM PDT by NCC-1701 (PUT AN END TO ORGANIZED CRIME. ABOLISH THE I.R.S.)
[ Post Reply | Private Reply | To 40 | View Replies]

To: tx_eggman

I would never disagree with you on that point. How much misery and fear must we live with for such an outcome! LOL


43 posted on 08/24/2007 2:12:00 PM PDT by dforest (Duncan Hunter is the best hope we have on both fronts.)
[ Post Reply | Private Reply | To 41 | View Replies]

To: blam

I wish we had his methodology. I have my doubts. I wonder if he only accounted for the actions of the known planets to account for the planetary trigger of Kuiper belt objects? His point was that Jupiter may throw a bunch out of the solar system, but it pulls in some number too. My guess is that interactions among Kuiper belt objects themsleves and interstellar matter like gas clouds have a lot more to do with generating comets than Jupiter does these days.

I’m just say’n, it would be real easy to get this one wrong.


44 posted on 08/24/2007 2:12:12 PM PDT by Hail Spode
[ Post Reply | Private Reply | To 1 | View Replies]

To: clamper1797
Photo Sharing and Video Hosting at Photobucket
45 posted on 08/24/2007 2:16:58 PM PDT by rfp1234 (Nothing is better than eternal happiness. A ham sandwich is better than nothing. Therefore...)
[ Post Reply | Private Reply | To 5 | View Replies]

To: blam

Stupid Jupiter.


46 posted on 08/24/2007 2:17:36 PM PDT by Antoninus (The greatest gifts parents can give their children are siblings.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Shadowstrike
Scientist, can’t live with them, but could we try living without them?

Sure you can ... if you would care to return to the 25 year expected lifepsan of humans before civilization arose.

47 posted on 08/24/2007 2:22:35 PM PDT by Centurion2000 (“Jesus Saves. Moses Delivers. Cthulu Reposesses...”)
[ Post Reply | Private Reply | To 14 | View Replies]

To: ozzymandus

Eheu!Totum de caelo caeruleo venit!


48 posted on 08/24/2007 2:24:00 PM PDT by mathurine
[ Post Reply | Private Reply | To 4 | View Replies]

To: Drew68
"All these worlds are yours except Europa!"
49 posted on 08/24/2007 2:29:00 PM PDT by Roccus (sync//sync//eot)
[ Post Reply | Private Reply | To 12 | View Replies]

To: M1Tanker

I wonder if this guy’s theory will be disproved in a few more years. I still believe that the earth is a very privileged planet, in many ways.


50 posted on 08/24/2007 2:49:36 PM PDT by DeweyCA
[ Post Reply | Private Reply | To 32 | View Replies]


Navigation: use the links below to view more comments.
first 1-5051-85 next last

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
News/Activism
Topics · Post Article

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