PDA

View Full Version : Need FACTS about galactic equator and solar system



anonymouse12
2009-Aug-11, 06:21 AM
The more I research the more confused I get,

One thing is clear, the alignment of earth and sun in 2012 is purely visual and has no global/galactic or physical significance.

NOW about our solar system(which moves in a sinosidal wave while revolving around galactic center). will it cross the galactic plane around 2012 ??

This is the confusing bit and is the bit that can have actual physical significance if true.

I have found all credible but opposing views, Researchers at the Cardiff Centre of Astrobiology have built a computer model of the Solar System's journey around the Milky Way so maybe they are more accurate in which case we haven't passed the galactic plane and will pass in the near future, don't know what to believe

1.
IT HAS ALREADY CROSSED 3 Million years ago
http://fluorideisbad.wordpress.com/files/2009/06/arrow32.jpg
http://www.nature.com/nature/journal/v316/n6030/abs/316706a0.html
http://the2012deception.net/




So, the question is, are we going to cross that galactic plane in 2012? Not even close. According to the journal nature, as well as many others, there is evidence of crossing this plane 3 million years ago. This would mean that we are moving away from the galactic plane and won’t be due to cross it for another 30 million years. In addition the margin of error in these calculations in at least 2.1 parsecs or about 6.5 light years making images like these completely meaningless. To conclude: If you hear someone tell you that the earth is on a 26,000 year cycle to align with the galaxy ask them how the wobble of the earth will change its position in relation to the galaxy. Similarly, if you hear someone say that the earth is on a 250 million year cycle to align with the galaxy ask them if they know that this happened 3 million years ago and wont happen again for another 30 million.

Doesn't the margin of error mean that we could be on the approach ?

2.
NO ONE CAN CALCULATE ACCURATELY IF IT HAS CROSSED OR NOT
http://www.universetoday.com/guide-to-space/galaxies/galactic-equator/


You might be interesting to know that the Solar System bobs up and down above and below the galactic equator. It takes 64 million years to complete a full cycle going above and below the galactic equator. If you're heard that the Solar System is supposed to cross the galactic equator in 2012, don't worry, that's a myth. It takes 64 million years to complete that cycle, so there's no way to know exactly when it will actually cross the galactic equator.


3.
IT IS GOING TO CROSS IN THE NEAR FUTURE
http://www.universetoday.com/2008/05/06/comet-strikes-increase-as-we-pass-through-the-galactic-plane/



Researchers at the Cardiff Centre of Astrobiology have built a computer model of the Solar System's journey around the Milky Way. Instead of making a perfectly flat orbit around the galaxy's centre, it actually bounces up and down. At times it can rise right up out of the galactic plane – getting 100 light years above – and then dip down below it. They calculated that we pass through the plane every 35 to 40 million years.

And here's the bad news. According to their calculations, the Solar System will be passing through the galactic plane in the near future

tusenfem
2009-Aug-11, 09:21 AM
Dear anonymouse12.

Welcome to the board. Please take some time to acquaint yourself with the rules of this board. (http://www.bautforum.com/forum-rules-faqs-information/32864-rules-posting-board.html#post564845).

I have let this message through, though you are advised to search the board for all the 2012 threads that have already been done here.

Although, this does look like general questions that some may have an answer to here on BAUT.

Have fun.

anonymouse12
2009-Aug-12, 01:41 AM
Yes, Thankyou, I have done a search , read the threads, no one has asked a question based on some facts to back it up so waiting for a response from you guys :)

StupendousMan
2009-Aug-12, 04:18 PM
Chen et al. Stellar Population Studies with the SDSS. I. The Vertical Distribution of Stars in the Milky Way (http://adsabs.harvard.edu/abs/2001ApJ...553..184C)
used the SDSS database of millions of stars to estimate the Sun to be 27 +/- 4 parsecs from the plane of the Milky Way. The "vertical" component of the Sun's motion through the Galaxy is just a few km/sec, which means it will be millions of years until the Sun reaches the plane.

You can do the conversions and calculations yourself if you wish.

anonymouse12
2009-Aug-13, 08:55 AM
Chen et al. Stellar Population Studies with the SDSS. I. The Vertical Distribution of Stars in the Milky Way (http://adsabs.harvard.edu/abs/2001ApJ...553..184C)
used the SDSS database of millions of stars to estimate the Sun to be 27 +/- 4 parsecs from the plane of the Milky Way. The "vertical" component of the Sun's motion through the Galaxy is just a few km/sec, which means it will be millions of years until the Sun reaches the plane.

You can do the conversions and calculations yourself if you wish.

SO is that approaching or going away ?


explains the mistake in the press article which Anonymouse11 linked:


Hi
the universetoday article took it from the Cardiff University press release from the Department of Astrobiology.

Did the solar system bounce finish the dinosaurs? (http://www.cardiff.ac.uk/news/articles/did-the-solar-system-bounce-finish-the-dinosaurs.html)


The periods of comet bombardment also coincide with mass extinctions, such as that of the dinosaurs 65 million years ago. Our present position in the galaxy suggests we are now very close to another such period.

And the actual paper says (very end of page 4):
http://www.astrobiology.cf.ac.uk/impact_cratering_07may08.pdf

Both our position relative to the Galactic plane (Joshi 2007 and
references therein) and the impact cratering record indicate that we
are presently in, or very close to, the peak of an impact episode.

People who wrote the paper (not exactly light weight and employed a computer model):
Professor Nalin Chandra Wickramasinghe
BSc (Ceylon), MA, PhD, ScD (Cantab), Hon DSc (Sri Lanka, Ruhuna), Hon DLitt (Tokyo, Soka), FIMA, FRAS, FRSA

Professor and Director of the Cardiff Centre for Astrobiology, Cardiff University Honorary Professor, University of Glamorgan

Bill Napier
Research Astronomer
EDUCATIONAL DETAILS:
B.Sc. in Astronomy, Glasgow University, 1963
Ph. D. in Astronomy, Glasgow University, 1966

BACKGROUND:
Lecturer in Applied Mathematics, Royal Holloway College, 1966-67
Astronomer at Royal Observatory, Edinburgh, 1967-92
Research Fellow at Oxford University, 1994-96
Leverhulme Fellow at Armagh, 1996-98
Research Astronomer at Armagh, 1996-2001
Emeritus Researcher at Armagh, 2001-present
Honorary Professor at Institute for Astrobiology, University of Cardiff, 2001-present

Jens
2009-Aug-19, 07:55 AM
NO ONE CAN CALCULATE ACCURATELY IF IT HAS CROSSED OR NOT


I'm just a layman on this issue. But I can understand the difficulties involved. We are inside the Milky Way, so it's really hard to tell where the plane is. So pinning it down to a single year would seem extremely hard to do and essentially meaningless. Imagine yourself swimming the length of a pool, with only goggled eyes to see where you are, and try to pin down the second where you cross the center. Just last year, something new was discovered about the Milky Way, that it has two main bars or something like that.

astromark
2009-Aug-19, 09:44 AM
Jens has put it well... The velocity the solar system is transverseing the central plain of the MilkyWay and the size of that central plain do make it hard to pin down.
Is it interesting that our ability to see Earth crossing objects has and will improve to be better when we need it. but... do we want to know. :(