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
Opus: The Day We Found Earth Opus: The Day We Found Earth Opus: The Day We Found Earth (stylized as OPUS: The Day We Found Earth) is an adventure game focused on story and exploration, developed by SIGONO (originally Team Signal), an independent game developer from Taiwan. It was first released on iOS and Android on October 22, 2015. A PC port was later released on Steam, available for Microsoft Windows and Mac OS X users. The game was nominated for Best Meaningful Play at the 12th International Mobile Gaming Awards on February 16, 2016. "OPUS: The Day We Found Earth" is an exploration adventure game