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RE: Dark blobs as stealthy dark matter
I wonder why we would only encounter a blob once a year? If dark matter acts gravitationally, then you would expect there to be a ring of the stuff in the orbit of most stars and planets, and by extension a little ring of blobs in the Earths orbit.
Very good question. Thanks for asking!
The point is that the density of dark matter is well measured. Therefore, the more massive a single blob is, the smaller number of blobs is required to get the right relic density of dark matter. Consequently, the blob flow going through Earth is smaller.
For blobs lighter than 1000 tons, we are guaranteed to have a flow sufficient for having at least one of them going through us each year.
Does it clarify?
Ha ha unfortunately no it doesnt. What is 'relic density', and why does density have any bearing on the orbit?
This is explained in details in this post. In short:
Now dark matter is spread all over the universe and dark matter particles can go through Earth. Those are the ones that one tries to detect.
Hopefully, now it will be slightly clearer ;)