Star leaving MW

[robnissen]

Interesting article here about a neutron star being booted out of the MW at 3 Million MPH.<br /><br />http://www.space.com/scienceastronomy/071128-cosmic-cannonball.html<br /><br />This article got me to wondering two things:<br /><br />1. If some passing star interaction resulted in the sun being booted out of the MW, would all the planets (or at least the inner planets) tag along? My guess is that at least the inner planets would tag along.<br /><br />2. Assuming that at least the inner planets tagged along, is there any reason to think that there would be a negative impact for life on earth? My guess is that there would be minimal to no impact on life on earth.<br /><br />Thoughts?

 

[MeteorWayne]

Well, as I understand it, if there was such a gravitational interaction that booted the sun out of the MW, the solar system would be completely trashed by the encounter. Anything massive and close enough to the sun to create such a scenario would completely disrupt the solar system, so there would be no planets in orbit to tag along.<br /><br />That being said, if they were, I think you are correct, other than our Constellations being wasted really fast, life would go on. But as I said, if the sun is ejected, we're long gone.<br /><br />MW <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[shadow735]

I forget the name of the galaxy I think it is andromeda galaxy but its supposed to collide with our galaxy we are on the spiral arms so we could be flung out of the galaxy, I would think there would be the possability that our solar system would remain intact.<br />Then again by that time our Sun will have most likely be at the end of its life and the earth fried.. <div class="Discussion_UserSignature"> </div>

 

[vandivx]

in that article it says that "The neutron star is racing out of our Milky Way Galaxy at about 3 million mph (4.8 million kph)."<br /><br />now I wanted to find out what fraction of speed of light that speed is so I wrote into google "what is speed of light in miles per second" and up popped single answer "the speed of light = 186 282.397 miles per second" and I started to laugh because that was like talking to some robot like in star wars ship <br /><br />than I realized I need the speed per hour (the speed per second I could have rememberd myself if need be <img src="/images/icons/smile.gif" /> so I corrected my querry to read 'per hour' and that single answer got corrected to "the speed of light = 670 616 629 miles per hour"<br /><br />this makes the star speed 0.00448 the speed of light or the speed of light is 223 times faster than this star travels<br /><br />what a punny speed that star has<br />also the fastest stars discovered before this one travel at about one third of its speed, now that's a crawl<br /><br />vanDivX <div class="Discussion_UserSignature"> </div>

 

[alokmohan]

One of the fastest moving stars ever seen has been discovered with NASA's Chandra X-ray Observatory. This cosmic cannonball is challenging theories to explain its blistering speed. <br />http://www.spaceref.com/news/viewpr.nl.html?pid=24122<br />Astronomers used Chandra to observe a neutron star, known as RX J0822-4300, over a period of about five years. During that span, three Chandra observations clearly show the neutron star moving away from the center of the Puppis A supernova remnant. This remnant is the stellar debris field created during the same explosion in which the neutron star was formed about 3700 years ago. <br /><br />By combining how far it has moved across the sky with its distance from Earth, astronomers determined the neutron star is moving at over 3 million miles per hour. At this rate, RX J0822-4300 is destined to escape from the Milky Way after millions of years, even though it has only traveled about 20 light years so far. <br /><br />"This star is moving at 3 million miles an hour, but it's so far away that the apparent motion we see in five years is less than the height of the numerals in the date on a penny, seen from the length of a football field," said Frank Winkler of Middlebury College in Vermont. "It's remarkable, and a real testament to the power of Chandra, that such a tiny motion can be measured." <br /><br />

 

[3488]

AFAIK, the stars, AE Aurigae, Mu Columbae & 53 Arietis are also on galactic escape trajectories.<br /><br />Thought to have originated approx 2 million years ago in the M42 / M43 nebula. <br /><br />The Barnard Loop possibly being whats left of the fourth member.<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[themage]

I remember a loooong while back reading a SDC article about a quasar a few billion light years away ejecting the equivalent mass of our sun every so often at some ungodly speed like 90% of light speed. I really should try to dig that one up and check on the speed of it.

 

[Mee_n_Mac]

<font color="yellow">1. If some passing star interaction resulted in the sun being booted out of the MW, would all the planets (or at least the inner planets) tag along? My guess is that at least the inner planets would tag along. <br /></font><br /><br />It the gravity feild over the solar system was constant (ie the disturbing star is far enough away) then the planets would all experience the same acceleration and so the system would move en masse. If the star passes very close then the feild won't be flat and then you'll lose some planets I'd guess.<br /><br /><br /><font color="yellow"><br />2. Assuming that at least the inner planets tagged along, is there any reason to think that there would be a negative impact for life on earth? My guess is that there would be minimal to no impact on life on earth. <br /></font><br /><br />I'd worry about the disturbance to the Oort cloud raining down another storm of meteors. {assuming we lost the outer planets}<br /><br /> <div class="Discussion_UserSignature"> <p>-----------------------------------------------------</p><p><font color="#ff0000">Ask not what your Forum Software can do do on you,</font></p><p><font color="#ff0000">Ask it to, please for the love of all that's Holy, <strong>STOP</strong> !</font></p> </div>

 

[MeteorWayne]

In order for the sun to be ejected from the MW, the interaction would have to be EXTREMELY close, and would disrupt the solar system <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[ashish27]

This is very interesting story, and a very rare one at that.<br /><br />If this thing is to happen to our Sun, or any star that has planets,I think most of the smaller planets would go along with it.<br /><br />But if that is to happen, a planet like Earth would be more exposed to collisions with extra-stellar asteroids and comets thereby putting life on it at risk.

 

[MeteorWayne]

You don't get it.<br /><br />If there is such gravitaional interaction that the Sun can be accelerted enough to be ejected from the Milky Way, the planets will be scattered so far and wide, in a century, you wouldn't be able to tell where the dead planets came from. All of the planets. Small, large, makes no difference.<br /><br />Earth wouldn't be more exposed to impacts, since it will be so far gone, there will be nothing to run in to.<br /><br />Life will be dead long before that; with no sun, the earth will freeze solid very quickly.<br /><br />Sorry to be pragmatist. <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[ashish27]

prove what you are saying! <img src="/images/icons/laugh.gif" /><br /><br />

 

[MeteorWayne]

I don't really have to, but if you insist, I will do it.<br /><br />Do you have any idea of what it takes to eject a star from the Milky Way?<br />Apparently not.<br /><br />You are talking about a neutron star or black hole or possibly a dead stellar remnant of another kind coming closer to the sun than Mecury.<br /><br />Please show me what mass and path could provide enough momentum to the Sun (as I said, the solar sytem would be scattered by the process) to eject it from the Milky Way.<br /><br />I submit your supposition is so ludicrous, you need to show the feasibility before I need to defend such an obviously meaningless point.<br /><br /> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[3488]

Hi ashish,<br /><br />I do not think you realise the energy involved to throw the Sun out of the Milky Way,<br />in the way you suggest.<br /><br />Really as MeteorWayne, explains, it will take a MASSIVE object with an ENORMOUS gravitational<br />pull. <br /><br />The Sun's planets would be scattered in the process. <br /><br />Some of our planets may even be adversly effected physically by the encounter, <br />as well as some losing some, if not all of their moons.<br /><br />This would be a disaster on an unimaginable scale.<br /><br />If the Sun was ejected through millions of years of mutual interactions of routinely <br />passing stars, that would be a different matter. However, what you suggested was not that scenario. <br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[exoscientist]

Chandra Discovers a Cosmic Cannonball<br />10.28.2007<br />"This isn't the first time astronomers have found million-mph stars. So-called "hypervelocity stars" have been previously discovered shooting out of the Milky Way with speeds around one million miles per hour. One key difference between RX J0822-4300 and these other reported galactic escapees is the source of their speed. Hypervelocity stars are thought to have been ejected by interactions with a supermassive black hole in the Galaxy's center, which can act as a sort of "gravitational slingshot." This neutron star, by contrast, was flung into motion by a supernova. Data suggest the explosion was lop-sided, kicking the neutron star in one direction and the debris from the explosion in the other.<br />"The breakneck speed of the Puppis A neutron star is not easily explained, however, by even the most sophisticated supernova explosion models. "The puzzle about this cosmic cannonball is how nature can make such a powerful cannon," says Winkler. "The velocity might be explained by an unusually energetic explosion," but researchers remain unsure."<br />http://science.nasa.gov/headlines/y2007/28nov_cosmiccannonball.htm?list885344<br /><br />I have proposed an alternative explanation: planetary impacts after the star goes nova. <br />This report shows that brown dwarfs could be up to nearly 1/10th of a solar mass:<br /><br />Massive Object Calls Planet Discoveries into Question.<br />By Robert Roy Britt<br />Senior Science Writer<br />posted: 19 January, 2004<br />1:05 p.m. ET<br />http://www.space.com/scienceastronomy/heavy_objects_050119.html<br /><br />Then the speed imparted to the star could be up to 1/10th that obtained by the impacting "planet" by momentum conservation.<br />Actually, it might even be possible if the planet was onl <div class="Discussion_UserSignature"> </div>

 

[thebigcat]

My guess is that this star found out that Humans might be leaving the Earth and going out into the Galaxy and wanted to get the heck out of Dodge. <img src="/images/icons/wink.gif" /> <div class="Discussion_UserSignature"> </div>