The Naked Scientists

The Naked Scientists Forum

Author Topic: How much dust and debris lands on Earth from space each year?  (Read 3890 times)

Offline chris

  • Neilep Level Member
  • ******
  • Posts: 5339
  • Thanked: 65 times
  • The Naked Scientist
    • View Profile
    • The Naked Scientists
I came across this very thorough analysis of this question today, so I'm posting it here for the interest of others:

http://www.answersingenesis.org/tj/v7/i1/moondust.asp

Chris


 

Offline Vern

  • Neilep Level Member
  • ******
  • Posts: 2072
    • View Profile
    • Photonics
How much dust and debris lands on Earth from space each year?
« Reply #1 on: 05/02/2009 13:23:18 »
After scanning through the whole thing and studying portions closely it seems that the consensus of studies come down to a range of 10,000 to 20,000 tons per year of cosmic debris landing on earth.

I don't have a dog in that hunt. It doesn't matter to me which way it is. But it seems that creationist hypothesis needs the number to be much larger so that they can cite the thin layer of dust on the moon as evidence of a young earth.
« Last Edit: 05/02/2009 13:25:26 by Vern »
 

Online yor_on

  • Naked Science Forum GOD!
  • *******
  • Posts: 12000
  • Thanked: 4 times
  • (Ah, yes:) *a table is always good to hide under*
    • View Profile
How much dust and debris lands on Earth from space each year?
« Reply #2 on: 05/02/2009 15:37:02 »
A very impressive and comparatively unbiased paper it seems to me.
And a very good question.

But it seems that there are less dust than expected even though it doesn't support a creationist view?
That's interesting.
 

Offline Vern

  • Neilep Level Member
  • ******
  • Posts: 2072
    • View Profile
    • Photonics
How much dust and debris lands on Earth from space each year?
« Reply #3 on: 05/02/2009 15:55:38 »
Yes; it seems that we were expecting something more by about an order of magnitude.
 

Offline jj73

  • First timers
  • *
  • Posts: 3
    • View Profile
How much dust and debris lands on Earth from space each year?
« Reply #4 on: 09/02/2009 17:40:39 »
Maybe the rate of accretion is lower in modern times ? Surely the rate of accretion is proportional to the amount of debris available in Earth orbit. Likely Earth has thinned out this debris cloud over the last 4 billion orbits.

From the cited paper :

"...the crater-saturated lunar highlands are evidence of a higher meteorite and meteoritic dust influx in the past."
« Last Edit: 09/02/2009 17:43:05 by jj73 »
 

The Naked Scientists Forum

How much dust and debris lands on Earth from space each year?
« Reply #4 on: 09/02/2009 17:40:39 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums