Subject: Re: Moon Dust Argument ajs9462@sigma.tamu.edu (SIMON, ANTHONY JOE) writes: Hopefu

```

From:    Ron Dippold
Subject: Re: Moon Dust Argument

ajs9462@sigma.tamu.edu (SIMON, ANTHONY JOE) writes:
>Hopefully, someone will be able to fill in all the details
>and/or correct me where I'm wrong.

From the (a) FAQ

}  - Lunar dust--only 1 to 3 inches, not 54 feet.

The calculation you refer to is given by Henry Morris on pp.
151-153 of _Scientific Creationism_. It is based on a grossly
erroneous figure of 14 million tons of meteoritic dust per
year, quoted by Petterson in 1960.

Morris misinterpreted Petterson's article. Petterson published a
figure of 15 (not 14) million tons per year as an _upper limit_.
In other words, Petterson said that the value is _not more than_
15 million tons per year. He was not able to measure an actual value.

Morris erroneously chose to interpret it to mean it was _equal_
to 14 million tons per year. Accurate values were measured in
the late 1960's. The actual value is -much- lower than 15 million
tons per year.

Dalrymple gives the value of 22,000 tons per year, nearly 700
into about 2 cm, which is quite consistent with the amount of
surface soil the astronauts found on the Moon (it was considerably
more than 1-2 mm).

My copy of "Everyman's Astronomy" indicates that the earth
collects about 9000 kg per day from meteors of visual magnitude
5.0 or brighter.  Assuming a typical rock density of 3 g/cc, this
corresponds to an accumulation rate of one inch per 10 billion
years.

Unfortunately no data is presented for fainter meteors.  I wouldn't
be surprised to find accumulation rate of one inch per 10 billion
years.  Unfortunately no data is presented for fainter meteors.  I
wouldn't be surprised to find that the actual rate is one or two
orders of magnitude higher, but "1 inch in 8000 years" is off by
six orders of magnitude.

A dust accumulation rate of "one inch per 8000 years" should
create a spectacular yearround meteor shower, and cause severe
pitting of the space shuttle windshields in just a single orbit.
My quick estimates give values far higher than have been actually
observed.

```

E-Mail Fredric L. Rice / The Skeptic Tank