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Letter from the editor

Chelyabinsk Meteorite

"The Chelyabinsk impact is the most well-documented event of this kind and provides a unique opportunity to calibrate the different approaches used to model meteoroid entry and to calculate the damaging effects of the resulting shock waves and radiations. ..." – By Olga Popova

Hot Planetary Coronas

"The uppermost layers of a planetary atmosphere, where the density of neutral particles is vanishingly low, are commonly called exosphere or planetary corona. Since the atmosphere is not completely bound to the planet by the planetary gravitational field, light atoms, such as hydrogen and helium, with sufficiently large thermal velocities can escape from the upper atmosphere into interplanetary space. ..." – By Valery I. Shematovich and Dmitry V. Bisikalo

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