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Letter from the editor

Composition of Earth

"Athanasius Kircher (1602–1680), a Jesuit scholar and polymath, described in his book, Mundus Subterraneus, the interior of the Earth. He postulated a huge fire in the center of the Earth, feeding numerous smaller fire seats in the mantle. These fires were connected with the central fire and interconnected through a system of channels. Some of these channels reached the surface of the Earth, feeding volcanoes. ..." – By H. Palme

Clouds in the Martian Atmosphere

"Although resembling an extremely dry desert, planet Mars hosts clouds in its atmosphere. Every day somewhere on the planet a part of the tiny amount of water vapor held by the atmosphere can condense as ice crystals to form cirrus-type clouds. ..." – By Anni Määttänen and Franck Montmessin

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