A temperature map of the Sun's corona as recorded by the EIT instrument on SOHO
Science & Exploration

12 December

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ESA / Science & Exploration / Space Science

1871: On 12 December 1871, French astronomer Jules Janssen made spectroscopic observations of an eclipse in India.

The observation confirmed his own theory that the corona, normally only visible during a solar eclipse, is a physical part of the Sun and is composed of both hot gases and cooler particles.

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