Abstract
The studies of the glaciologists show that, since 30,000 years, the Earth receives every year approximately 40,000 tons of dust, dust with an average size about 200 microns. By determining of which volume these 40,000 T come and by showing that the density of this volume is significant within the density of the milky way, I have tried to estimate the mass of dust contained in the Galaxy. To support that this density close to earth is representative, arguments are given: 1) the distribution of great dust is largely homogeneous in the galaxy (what does not exclude the existence of gas or dust clouds with different densities in the milky way); 2) there would be a minimum size that I have calculated for micrometeorites in the solar environment, and so there would be a lack of the micrometeorites with a size between 5 and 50 microns. So the density would not be greater in the solar system. Next, a very simple rough calculation (as the one made by the observatory of Paris in 1910) allows estimating this mass near 4 times that of the dark matter. So, the interstellar dust with a large size (>200 μ) could it be the missing mass? A verification method is proposed to confirm or refute this hypothesis.
Highlights
Every year, the Earth receives 40,000 T of dust and this figure has not varied since at least 30,000 years [1]
By determining of which volume these 40,000 T come and by showing that the density of this volume is significant within the density of the milky way, I have tried to estimate the mass of dust contained in the Galaxy
To support that this density close to earth is representative, arguments are given: 1) the distribution of great dust is largely homogeneous in the galaxy; 2) there would be a minimum size that I have calculated for micrometeorites in the solar environment, and so there would be a lack of the micrometeorites with a size between 5 and 50 microns
Summary
The Earth receives 40,000 T of dust and this figure has not varied since at least 30,000 years [1]. In her thesis of 2010, Dobriča [3] specifies that on every m2, it falls an average of one micrometeorite every year (or 30.000 tons against only 10 tons of macroscopic meteorites). They are too small so that we notice it (their size is about 200 microns). During a collection in Antarctica in 2006, in 24 m3 of the filtered snow were extracted more than 1300 micrometeorites This average size of 200 microns does not correspond to what we suppose on the dark matter. We have to question the homogeneous distribution of dust and see if the size of dust would be representative
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