<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">cosmic rays</topic></authority><related type="broader"><topic>electromagnetic radiation</topic></related><variant type="other"><topic>GCR</topic></variant><variant type="other"><topic>cosmic ray</topic></variant><variant type="other"><topic>galactic cosmic rays</topic></variant> <note 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. ]]></note></mads>