Could a volcano block out the sun?
Andrew Rivera
Published Jan 19, 2026
Two hundred years ago, half of the world went dark. The Tambora volcano in what is now Indonesia blew its top in April 1815, killing more than 60,000 people and turning the summer into winter across much of the Northern Hemisphere.
Tambora
Mount Tambora is still active and minor lava domes and flows have been extruded on the caldera floor during the 19th and 20th centuries. The last eruption was recorded in 1967.
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