International condemnation has followed North Korea's claim it has successfully tested a hydrogen, or "H," bomb. If confirmed, such a test would mark a major upgrade in North Korea's capabilities. But there are questions about the claim.
North Korea has previously successfully tested fission, or atom-splitting, bombs, known as atom bombs.
Hydrogen bombs use fusion, or atomic nuclei coming together.
They are much more powerful -- a thousand times or more -- and have the potential to cause much more damage.
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