Atmosphere of Earth However, polar stratospheric or nacreous clouds are occasionally seen in the lower part of this layer of the atmosphere where the air is coldest. The stratosphere is the highest layer that can be accessed by jet-powered aircraft. The troposphere is the lowest layer of Earth's atmosphere. It extends from Earth's surface to an average height of about , although this altitude varies from about at the geographic poles to at the Equator, with some variation due to weather. The troposphere is bounded above by the tropopause, a boundary marked in most places by a temperature inversion (i.e. a layer of
The Earth Museum are like lamps lighted where we need them most, illuminating what is around them and the way we need to go. The fuel of those lamps is the imagination. Thank you, my Turkish readers and friends and fellow-writers, for keeping the light burning."" (Ursula K. Le Guin, January, 2018) The Earth Museum features Burak Albayrak as the editor, Tuðçe Nida Sevin as the coordinator and includes a preface by Bulent Akkoc. The collection comprises the following short stories: The Earth Museum The Earth Museum () is an anthology of 18 science-fiction stories by 18 Turkish sci-fi writers published in January