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Old 06 February 2014, 04:37 PM
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Richard W Richard W is offline
Join Date: 19 February 2000
Location: High Wycombe, UK
Posts: 26,437

ATNM, they may be using "cross section" as a measure of size, which is a concept used in particle physics to measure (essentially) how likely things are to hit each other (well, interact with each other to be slightly more precise). It's obviously not the same as the physical cross-section that we're used to in macroscopic objects but it's kind of analagous so it wouldn't necessarily be misleading in a comparison.

I don't know whether the comparison is true based on that assumption - I might be able to check later - but neutrinos are pretty unlikely to hit things, so it's not obviously wrong either.
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