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Reference.org
Antimatter comet
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<p>Antimatter comets and antimatter meteoroids are hypothetical <a href="/facts/Comet/w34utQCd">comets</a> and <a href="/facts/Meteoroid/5PexF2mR">meteoroids</a> composed solely of <a href="/facts/Antimatter/NvpGDLof">antimatter</a> instead of ordinary <a href="/facts/Matter/osyc04UN">matter</a>. Although never actually observed, and unlikely to exist anywhere within the <a href="/facts/Milky_Way/ulF6lccN">Milky Way</a>, they have been hypothesized to exist, and their existence, on the presumption that hypothesis is correct, has been put forward as one possible explanation for various observed natural phenomena over the years. </p>