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Science Forum Index » Astro Forum » How long ago was the Arizona asteroid's impact?...
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| Ramon F Herrera... |
 Posted: Tue May 06, 2008 11:26 am |
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I visited the Arizona crater a few years ago, and recall that its age
was about 20,000 years. It seems that the date has been changed to the
upper bound of 50,000 miles.
What changed (if anything, maybe my recollection is wrong)? Is this a
marketing decision or does it reflect actual research?
I am quite surprised at the lack of accuracy, BTW.
-RFH |
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| dlzc... |
| Posted: Tue May 06, 2008 1:26 pm |
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Dear Ramon F. Herrera:
On May 6, 2:26 pm, Ramon F Herrera <ra... at (no spam) conexus.net> wrote:
Quote: I visited the Arizona crater a few years ago,
and recall that its age was about 20,000 years.
It seems that the date has been changed to the
upper bound of 50,000 miles.
"years"?
Quote: What changed (if anything, maybe my
recollection is wrong)?
No way!
Quote: Is this a marketing decision or does it reflect
actual research?
I am quite surprised at the lack of accuracy,
BTW.
http://en.wikipedia.org/wiki/Meteor_Crater
http://www.barringercrater.com/science/
11 years ago:
http://apod.nasa.gov/apod/ap971117.html
... ~49,000 years
Why would you be surprised at the lack of accuracy? Grassland does
not have much in the way of "tree rings", and the flash may have
destroyed all the carbon. Just curious.
David A. Smith |
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| Androcles... |
| Posted: Tue May 06, 2008 6:06 pm |
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"Ramon F Herrera" <ramon at (no spam) conexus.net> wrote in message
news:299c2c89-cc4d-490d-8877-a66f50bbb0dd at (no spam) b64g2000hsa.googlegroups.com...
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| I visited the Arizona crater a few years ago, and recall that its age
| was about 20,000 years. It seems that the date has been changed to the
| upper bound of 50,000 miles.
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| What changed (if anything, maybe my recollection is wrong)? Is this a
| marketing decision or does it reflect actual research?
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| I am quite surprised at the lack of accuracy, BTW.
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| -RFH
Well see, 50,000 miles in 20,000 years is 2.5 miles per year which is
MUCH faster than continental drift, only 2.5 cm per year. I too
am surprise at the lack of accuracy, but your recollection of years
being miles is... well... not exactly wrong, I don't wish to offend you,
so shall we say diplomatically somewhat out in left field? |
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