(meteorobs) Definition of a meteor (was Re: Fifth grade sciencebook)
GeoZay at aol.com
GeoZay at aol.com
Thu Apr 28 12:52:57 EDT 2005
>> Why would it be called a meteoroid then, when all the characteristics of
> being a meteoroid no longer exists?
The International Meteor Organization (IMO) definition of a Meteoroid is
A solid object moving in interplanetary space, of a size considerably
smaller than a asteroid and considerably larger than an atom or molecule.
Ed>> What characteristics George? If it is still a surviving object, it is
still in orbit around the Sun, be it a distorted one effected by gravity and
the retardation of the Earth's atmosphere. <<
The definition I found on IMO's website doesn't seem complete. But I suppose
this would be to include interstellar objects as well? Anyways, after the
light phase and while in the dark stage, the then falling object is no longer
in interplanetary space...it's in the earth's atmosphere dominated by the
earth's gravity. At this point, I'm hard pressed to see how the sun is gonna
jerk the falling object back into interplanetary space thru any gravitational
influence or velocity of the object? Other definitions I've seen for a
meteoroid included the small object to be in solar orbit. Again, objects in the dark
stage are no more in independent solar orbit than a sea gull. They both are
at the mercy of the earth...not the sun.
>> Even before it has entered the
atmosphere the orbit of the meteoroid has been altered by the gravitational
effects of the Earth and in some cases other objects it happens to
Altered yes, but still in an independent solar orbit at this stage.
>> Since this topic originated with a grade five sciencebook, I think we
are getting far too technical for such a grade level. Let them be children
and still wish on a falling star! ;-)<<
For all those fifth grade thinking people who find this is too technical for
them, I'd suggest hitting the delete button, when they see the subject
matter pertains to meteoroids and meteorites. :O)
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