I What is the average annual accumulation of cosmic dust on Earth?

AI Thread Summary
The average annual accumulation of cosmic dust on Earth is approximately 4 x 10^7 kg, translating to about 10^-7 kg/m^2/year when divided by the Earth's surface area. This dust includes materials from meteors and stardust, but excludes gas or liquid forms. The typical density of rock suggests that this accumulation results in a depth of less than 10^-10 m per year. The discussion also briefly touches on the collection of water, although details on that are less emphasized. Overall, the focus remains on the quantification of cosmic dust accumulation.
swampwiz
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By "accumulation", I mean depth at the Earth's surface (i.e., whatever volume it is would be divided up the surface area). This dust would be from anything (e.g., meteors, stardust, etc.), but would only count stuff that ends up as dust (i.e., no gas or liquid). I guess a follow-on question would be how much water collects.
 
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Have you tried an internet search?
 
The mass is 4x107kg/year according to this paper (which is linked off the Wikipedia page on cosmic dust, so you should have been able to find easily). The Earth's surface area is something like 5×1014m2, so around 10-7kg/m2/year. Typical density of rock is around 3-5×103kg/m3, for a depth of less than 10-10m/year. On that scale, what fraction is or isn't rock really isn't important.
 
PeroK said:
Have you tried an internet search?
It's swampwiz. So no.

We should be honored to always be his first stop.
 
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