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Reference.org
Geon (physics)
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<p>In <a href="/facts/General_relativity/jVsoIg8X">general relativity</a>, a geon is a nonsingular <a href="/facts/Electromagnetic_radiation/Ynx7ujCW">electromagnetic</a> or <a href="/facts/Gravitational_wave/4XWN3NtG">gravitational wave</a> which is held together in a confined region by the <a href="/facts/Gravitational_attraction/bqAN7DdQ">gravitational attraction</a> of its own <a href="/facts/Field_(physics)/FJdAKeRA">field</a> <a href="/facts/Energy/wd8PrQM7">energy</a>. They were first investigated theoretically in 1955 by <a href="/facts/John_Archibald_Wheeler/I1A5t0Fd">J. A. Wheeler</a>, who coined the term as a contraction of "gravitational electromagnetic entity". </p>