<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en">cosmic rays</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31432090</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 20:56:33</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">http://AATesaurus.cultura.gencat.cat/aat/getty_en</dcterms:isPartOf><dcterms:isPartOf xml:lang="en">Tesaurus d&apos;Art i Arquitectura</dcterms:isPartOf><dc:format>text/html</dc:format> <dcterms:alternative xml:lang="en">galactic cosmic rays</dcterms:alternative> <dcterms:alternative xml:lang="en">GCR</dcterms:alternative> <dcterms:alternative xml:lang="en">cosmic ray</dcterms:alternative> <dc:description xml:lang="en"><![CDATA[ High-energy particles arriving from outer space that are mainly protons (often referred to as hydrogen nuclei), but also include nuclei of heavier elements. When they arrive at Earth, they collide with the nuclei of atoms in the upper atmosphere, creating more particles. ]]></dc:description></metadata>